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WO/1995/022198A1 |
An amplifier circuit provides wide bandwidth low noise performance by minimizing the effect of a pole created by the feedback resistor (424) and the capacitance of the input device, such as a photodiode (10). This is accomplished by shif...
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WO/1995/022200A1 |
A voltage-controlled phase shift apparatus having an unlimited range for producing an output signal that varies in phase from an input signal by a predetermined phase difference. The phase shift apparatus includes a first delay circuit c...
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WO/1995/021488A1 |
A twisted-pair telephone line (100) is connected to a conventional telephone (at 103) via a low-pass filter and (102) equipment (at 106) for receiving signals in an upper frequency range e.g. 25-1000 kHz via a high-pass filter (105). The...
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WO/1995/020812A1 |
A method for designing a frequency periodic filter with a frequency response which has a periodic bandwidth including designing a first sampled data filter whose response corresponds to a set period and replacing each unit sampling delay...
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WO/1995/014339A1 |
The invention concerns a circuit (1) for clock recovery from an input signal (3, 4), particularly an alternating input signal formed from a data signal, the invention calling for a filter/amplifier unit (29) made up of several series-con...
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WO/1995/011549A1 |
Both ends of the primary winding of a transformer (T3 or T4) or a choke coil (L2 or L3) are connected to a current mirror circuit or a constant-voltage circuit. The AC component bypasses a transistor (Q1 or Q2) constituting a current mir...
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WO/1995/006856A2 |
An electronic filter conditioning a primary flow signal generated by a flowmeter comprises a first parallel bank of electronic filters including a first plurality (7) of band pass filters respectively including a first plurality (10) of ...
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WO/1995/006977A1 |
An active impedance termination circuit is composed of a differential amplifier stage composed of a long-tailed pair of transistors (12, 13) and a current mirror load (16, 17) which produces a single-ended output (18). A constant current...
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WO/1995/004401A1 |
The invention relates to a filter circuit adapted for integrated circuitry design and constituted by transistors or field effect transistors for controlling a frequency band, for example, in an amplification circuit of a signal receiving...
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WO/1995/002936A1 |
A node power isolator for connecting a node of a two conductor transmission line network such as a twisted pair line (20, 22) to the network so as to enable the DC powering of the node from the network itself without significantly dimini...
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WO/1995/002931A1 |
A line driver comprising: an input terminal (2) for receiving an input signal, an output terminal (10) for connecting a load (8), a first (12) and a second (22) transconductance-controlled transconductor having substantially equal transc...
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WO/1995/001652A1 |
A charge transfer circuit includes input terminals (68, 72) for receiving input electrical charges (Q in 1, Q in 2), transconductance amplifiers (G1, G2) having first and second inputs including inverting inputs, and first and second dif...
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WO/1995/001671A1 |
A circuitry arrangement for a resonant circuit that may be completely monolithically integrated and electrically tuned has a differential amplifier stage with two transistors T1, T1' fed by a constant current source I0 that are different...
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WO/1994/029947A1 |
A gyrator based resonator comprises first and second differential amplifiers cross coupled to form a quadrature phase voltage controlled oscillator. The differential amplifier circuits include matched transistor pairs and associated tran...
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WO/1994/029955A1 |
An equalizer (100) is suitable for removing the delay distortion from a switched digital signal received from a telephone channel where the delay distortion is caused by a bridge-tap connected to the telephone channel. The equalizer incl...
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WO/1994/028626A1 |
Electronic circuit such as an adjustable resistance, a negative resistance, a filter or similar comprising at least one first second generation current conveyer consisting of a mixed translinear loop and a plurality of current mirrors. T...
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WO/1994/027365A1 |
A combined recursive/transverse filter has an input element (E) and several integrating elements (I1 to In). The output signals of the integrating elements (I) to (In) are supplied to the inputs of two adders, each formed of individual a...
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WO/1994/027363A1 |
Two differential voltage-controlled current sources are applied on a substrate by CMOS technology. Each current source has an inverting and a non-inverting input. One current source is designed as an input element (E) and the other curre...
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WO/1994/027364A1 |
The electronic telephone circuit of a single chip telephone set with an integrated control system has a transmission and a reception amplifier built up of uniform amplifier modules used as input amplifier E and as load amplifier L. The i...
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WO/1994/022215A1 |
A transistor (16) in which the emitter terminal is coupled to ground through an electrolytic capacitor (26). The electrolytic capacitor (26) has a capacitance of from about 0.2 muf to about 100 muf and can be connected either by itself o...
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WO/1994/019763A1 |
A signal processing circuit which provides an accurate continuously tunable impedance. A tunable continuous time transconductor G(s) which may for example comprise an opto-electronic inductor, has a discrete time current processor -H(z) ...
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WO/1994/019867A1 |
A transconductance device particularly suitable for use as a high frequency active filter, having an input stage including at least one field effect transistor (M1) arranged to drive a laser diode (LD1), and an output stage comprising at...
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WO/1994/017590A1 |
A fast parasitic-insensitive continuous-time filter and equalizer integrated circuit that uses an active integrator is described. Circuit techniques for excess-phase cancellation, and for setting the corner-frequency of the filter and eq...
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WO/1994/017490A1 |
A fast parasitic-insensitive continuous-time filter and equalizer integrated circuit that uses an active integrator is described. Circuit techniques for excess-phase cancellation, and for setting the corner-frequency of the filter and eq...
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WO/1994/017589A1 |
A fast parasitic-insensitive continuous-time filter and equalizer integrated circuit that uses an active integrator is described. Circuit techniques for excess-phase cancellation, and for setting the corner-frequency of the filter and eq...
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WO/1994/010743A1 |
An active power line conditioner controller (50, 52, 54, 56, 58, 60, 62, 64, 66) is used to generate a reference signal that is applied to an active power line conditioner (40) to yield a sinusoidal load current for a nonlinear load (48)...
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WO/1994/010745A1 |
An active power line conditioner controller (90, 91, 92, 94, 96, 98, 100, 102) processes selected harmonic amplitude and phase errors of a power input signal to generate a reference signal. The reference signal is applied to an active po...
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WO/1994/010819A1 |
A hearing aid is permanently adjusted to match prescribed amplification characteristics at predetermined frequencies. A single channel filter (24) includes three identical filter stages (60, 62, and 64) that are optionally cascaded in se...
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WO/1994/009415A1 |
Method of controlling a current generator (1) having two voltage inputs (9, 10) and an output (13) connected to a load (6). In case the impedance of the load is lower than a first value, the generator is controlled in a non-feedback way ...
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WO/1993/021723A1 |
An impedance generator, especially suitable for determining a terminating impedance of a telephone line interface circuit, comprises a subtracting circuit (28) for forming a difference (Va) between an input voltage (Vin) multiplied by a ...
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WO/1993/020623A1 |
A filter (13) for providing temperature compensation for the quality factor thereof comprises transconductance amplifiers (23 and 24) in a gyrator configuration coupled between an input node (21) and an output node (22). A parallel capac...
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WO/1993/013710A1 |
A digital phase shifter capable of shifting the phases of data row by steps shorter than the sampling period even though the sampling signal the phase of which is fixed or a clock signal is used. This phase shifter comprises: a memory fo...
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WO/1993/012387A1 |
A converter circuit (11) provides an output signal of polarity opposite that of an input signal having a DC component and a low frequency periodic component in response to presence of that input signal. Current is transferred from a firs...
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WO/1993/003543A1 |
An integratable temperature-stable voltage controlled capacitor circuit comprising a variable gain current amplifier (10) connected in parallel and between a reference capacitor (20) and an input/output port (25, 26). The current amplifi...
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WO/1992/020151A1 |
Interface circuit for telephone exchange installations for the d.c. decoupling of two line sections, especially to convert symmetrical to asymmetrical voltage conduction. The ends of these two line sections are connected at the interface...
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WO/1992/020149A1 |
The invention relates to a frequency adjustment method for an RF bandpass filter, especially a combiner filter, wherein the center frequency of the passband of the RF bandpass filter (22) is adjusted in response to the RF power reflected...
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WO/1992/015952A1 |
An automatic impedance matching apparatus (10) for matching an RF-signal generator (2100) to a load (2300), such as a plasma etching chamber, is disclosed. The matching apparatus (10) comprises a matching network (20) having two variable...
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WO/1992/011695A1 |
Proposed is a circuit for tuning RC filters by means of a control voltage (U�R?) which acts on at least one frequency-defining component per filter stage concerned, the component being able to change its frequency-defining parameter un...
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WO/1992/011704A1 |
A quadrature signal generator provides differential in-phase signals, (I, I'), and differential quadrature-phase signals, (Q/Q'), in precisely a 90� quadrature relationship. A phase-locked loop configuration (100) comprises a voltage c...
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WO/1992/010031A1 |
Prior art universal filters have relatively expensive circuitry or overhead. The purpose of the invention is to provide a universal filter with simple and small circuitry. According to the invention, the universal filter with a biquad fi...
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WO/1992/007422A1 |
A filter circuit (250) disposed upon a single integrated circuit comprised of active fiter elements including transconductance elements (286-330) for a radiotelephone. The bandwidth of the passband of the filter is variable to pass alter...
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WO/1992/005632A1 |
The present application relates to an active bandpass amplifier comprising a single stage operational amplifier (2), a bridged "T" network (6) single frequency elimination filter in the negative feedback path of the amplifier and a phase...
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WO/1991/019353A1 |
An electrical circuit (200) comprises a first circuit (208) constructed and arranged to simulate an inductor and a second circuit (210) constructed and arranged to simulate an inductor. Coupled to these circuits is a third circuit (212) ...
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WO/1991/018427A1 |
An attenuator comprises a plurality of attenuation stages (10, 11, 12, 14) which are selectively switchable into or out of a signal path by switches (18 to 25) to provide a desired attenuation level. The switches may be RF switches such ...
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WO/1991/018341A1 |
Impulse noise suppression upstream of digital processing circuitry contains a sample and hold (S/H) mechanism (24) which samples the input signal and stores a plurality of sequential samples representative of the amplitude of the input s...
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WO/1991/017602A1 |
A delay circuit wherein MOS transistors (21, 22) for resistors for controlling the delay time of a CMOS inverter (26) are inserted between the source of the CMOS inverter (26) and power supply potentials (GND, Vdd) respectively and the r...
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WO/1991/016762A1 |
The invention concerns a circuit for the resonant cavity in a frequency-shift HF transmitter output stage, with a first capacitance (2), a first inductance (3) and a first switch (5) for feeding the HF signal to the resonant cavity. To s...
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WO/1991/011857A1 |
Analog circuit parts in an integrated circuit, for example filters, can be equalized by a control current by equalizing an additional reference circuit part, whose equalization must be verified externally, with this control current. By u...
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WO/1991/010286A1 |
In this phase shifter from an input signal (IN) two intermediate signals (V1, V2) are derived with a mutual phase shift of about 90 degrees. These signals (V1, V2) are then converted in two other signals (V3, V4) with equal amplitudes an...
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WO/1991/008533A1 |
A terminal comprising a terminal body (2) provided with a key-input circuit (21) and a CPU (22), and a switching unit (3) detachably connected to the terminal body (2) via connectors (4, 5). The number n of switching signal input termina...
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