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JP5755850B2 |
The discrete time analog circuit (100) is provided with: a rotate capacitor circuit (150); an amplifier (141) that is connected to the input line or the output line of the rotate capacitor (150), and amplifies the input potential or inpu...
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JP5733694B2 |
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JP2015084520A |
To provide a bandpass filter that suppresses a degradation of an attenuation amount and an attenuation of a gain of a desired wave, while dispensing with a local signal duty conversion circuit, which causes an increase in power consumpti...
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JP2015084497A |
To avoid injection of extra noise during sample period by a simple configuration.In an inverter INV10 creating an inverted sample clock signal SampleCK' for driving a MOS transistor M2 as a dummy capacitor, by inverting a sample clock si...
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JP2015039196A |
To provide passive switched-capacitor (PSC) filters that filter received signals and occupy a small area and consume low power in many applications.A PSC filter 1000 implements a second-order infinite impulse response (IIR) filter with t...
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JP2015039197A |
To provide filters that occupy a small area and consume low power.A passive switched-capacitor (PSC) filter 1000 implements a second-order infinite impulse response (IIR) filter with two complex first-order IIR sections. Each complex fir...
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JP5677986B2 |
Passive switched-capacitor (PSC) filters are described herein. In one design, a PSC filter implements a second-order infinite impulse response (IIR) filter with two complex first-order IIR sections. Each complex first-order IIR section i...
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JP2014220616A |
To provide a filter circuit that does not attenuate signals in a desired band but attenuates interfering waves of adjacent frequencies without influencing a circuit area.The filter circuit provided includes: one or more first capacitors ...
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JP5624162B2 |
A switched capacitor notch filter for sampling an input signal using multiple sampling capacitors during multiple non-overlapping time periods. The charge from one set of sampling capacitors is averaged and transferred to the filter outp...
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JP5624501B2 |
In a filter circuit comprising a plurality of low pass filters (LPFs) that are connected in series, each of the plurality of LPFs comprises a switched-capacitor circuit (SC), and a fully-differential amplifier (AMP) which amplifies a sig...
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JP5607904B2 |
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JP5554464B2 |
A switched capacitor type filter apparatus includes sampling capacitors and has a steep characteristic with a small number of taps. The filter apparatus includes positive polarity selecting switches, negative polarity selecting switches,...
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JP5548261B2 |
A switched capacitor notch filter for sampling an input signal using multiple sampling capacitors and multiple non-overlapping time periods. The charge from the sampling capacitors is averaged and transferred to the filter output during ...
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JP5545098B2 |
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JP5515292B2 |
(Problem) To provide a charge sampling filter circuit and a charge sampling method. (Means for resolution) A charge sampling filter circuit includes a first capacitor that samples an input signal, and in which at least a portion of elect...
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JP2014057317A |
To provide compact filters with low power consumption.A passive switched-capacitor (PSC) filter implements a second-order infinite impulse response (IIR) filter with two complex first-order IIR sections. Each complex first-order IIR sect...
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JP5425096B2 |
A sampling circuit and a receiver with which filter characteristics compatible with the reception of wideband signals can be realized with a high degree of freedom in the setting of the filter characteristics. More specifically, the samp...
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JP2014033341A |
To suppress the propagation of power supply noise, switch noise and operational amplifier noise to an output.A switched capacitor circuit is so controlled that: in a sampling period A, a first terminal of a capacitor C1 is connected to a...
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JP2014017550A |
To provide an AFIR circuit that simply suppresses out-of-band noise of a DAC without adding to the number of analog segments.An N-tap (N is an integer of two or more) filter circuit 130 includes: N-1 delay elements z-1 connected in serie...
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JP5393607B2 |
Provided is a direct sampling circuit in which signal mixing between systems is avoided, even when signal systems in which time sharing is integrated are used together by time sharing. History capacitors (153, 155) are connected at a pre...
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JP5355589B2 |
A sampling circuit and a receiver are provided having a high flexibility of filter design and excellent characteristics for removing an interfering wave. Provided also are a sampling circuit and a receiver having a low level of the highe...
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JP5308273B2 |
To provide a sampling mixer circuit, capable of effectively providing sampling pulses having a small duty ratio without increasing the frequency of the sampling pulses nor particularly narrowing down the duty ratio, and accordingly, to p...
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JP5279141B2 |
The sampling filter apparatus 100 includes the first sampling switch 130, the second sampling switch 131, the first integrator 1500 for integrating the charge input from the first sampling switch, the second integrator 1501 for integrati...
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JP5270652B2 |
A discrete-time receiver includes: a sampling mixer sampling an input signal according to a sampling clock; a discrete-time filter adjusting a decimation rate by using a control signal and filtering the sampled signal by using a filter c...
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JP5258559B2 |
Provided is a discrete filter capable of adjusting the number of notches and the notch frequency and easily eliminating a particular frequency component. In a sampling mixer (100), a control signal generation unit (104) generates a plura...
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JP5224287B2 |
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JP2013101494A |
To provide a switched capacitor integrator capable of saving electric power by suppressing a load of charging on an operational amplifier.The switched capacitor integrator includes an integrator 102 including an operational amplifier 122...
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JP5182897B2 |
A sampling filter device wherein the filter characteristic is variable without using a control signal of a complicated waveform is provided. A sampling filter device 105 has integration capacitors 130 and 131, an integration time adjustm...
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JP5182895B2 |
A sampling mixer includes TAs (transconductance amplifiers), an in-phase mixer section connected to the TA and the TA, an opposite-phase mixer section connected in parallel with the in-phase mixer section, and a signal generator for gene...
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JP2013505430A |
A wheel monitoring system that includes a tracking filter apparatus for tracking a signal that has a varying main frequency. The tracking filter apparatus has an adjustable filter and a filter controller arranged to measure the amplitude...
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JP5121069B2 |
The present invention has an object to provide a sampling filter apparatus and a wireless communication apparatus, which are capable of changing a filter characteristic without employing complex waveforms as control signals, and also, ca...
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JP5120080B2 |
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JP5089505B2 |
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JP5087103B2 |
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JP5078988B2 |
Provided are a direct sampling circuit and a receiver using a discrete time analog process and having a filter effect of a steep attenuation characteristic in a narrow-pass band without lowering a sampling rate. In a discrete time direct...
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JP5054229B2 |
A switched-capacitor decimator that can attenuate undesired signal components at odd harmonics of an output sample rate is described. In one design, the switched-capacitor decimator includes at least one sampling capacitor and multiple s...
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JP5056507B2 |
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JP5046622B2 |
The present invention aims at providing a sampling filter capable of changing a filtering characteristic without use of a complicate waveform as a control signal. A sampling filter 100 has a control section 140, a plurality of integrator...
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JP5038069B2 |
The present invention intends to provide a filter circuit in which an area occupied by the circuit can be reduced by suppressing the scale of its circuit configuration while a predetermined vicinity disturbance wave rejection ratio is ma...
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JP5019313B2 |
A direct sampling circuit and a receiver which carry out discrete time analog processing with a high degree of design freedom and are provided with a filter property which is achievable to comply with the receipt of a broad band signal. ...
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JP5019059B2 |
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JP5008665B2 |
Provided is a discrete filter capable of increasing degree of freedom of design including a DC gain. A sampling mixer (100) includes: a control signal generation unit (104) which generates a control signal including an SO signal; a Ch (6...
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JP4944242B2 |
A switched capacitor circuit employs a single operational amplifier to implement both an integrator and a summer. One input signal is routed to the input of the operational amplifier through (1) one or more integration branches, and (2) ...
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JP4928577B2 |
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JP2012080382A |
To provide a switched capacitor circuit, a filter circuit, a physical amount measurement device, an electronic equipment, etc., capable of further reducing an output noise component with a desired signal transfer function.A switched capa...
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JP2012034174A |
To reduce power consumption of a system while avoiding degradation of system performance.A switched capacitor circuit includes a capacitor C1, switches SW1 to SW4 provided on the input side and output side of the capacitor C1 respectivel...
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JP4861566B2 |
The switched capacitor filter circuit comprises an amplifier whose feedback capacitance Cf is variable. This feedback capacitance is changed based on the control signals received from the outside. Two switches control charging/dischargin...
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JP2012010329A |
To improve both of a response speed and monitoring accuracy in a signal monitoring system.A signal filter has a node, a first end, a second end, and an energy storage circuit connected to the node and the first and second ends. The node ...
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JP4844441B2 |
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JP4828993B2 |
The FM transmitter converts an input audio signal to a stereo composite signal, frequency-modulates the stereo composite signal and outputs the obtained signal. A stereo modulator stereo-modulates the output signal of the filter circuit,...
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