Title:
AMPLIFIER CIRCUIT FOR BROADBAND AND LOW-NOISE AMPLIFICATION OF A CAPACITIVE CURRENT SOURCE AND A SENSOR SYSTEM
Document Type and Number:
WIPO Patent Application WO/2024/047244
Kind Code:
A3
Abstract:
The invention relates to an amplifier circuit (1) for broadband and low-noise amplification of a capacitive current source, preferably a pyroelectric sensor, comprising a signal input (3) that can be connected to the capacitive current source at a node K1, an input stage (A1), wherein the input stage (A1) is connected to the node K1 at an input (7) of the input stage (A1), and has a node K2 at the output (9) of the input stage (A1), wherein the input stage (A1) is designed to amplify an input voltage at least by a factor of 3, wherein the input stage (A1) is designed to provide a high-value input resistance at the input of the input stage (A1), wherein the input stage (A1) is designed to provide a stable and load-independent voltage at the output of the input stage (A1), an amplifier cascade, wherein the amplifier cascade (11) has at least one first and one second amplifier (A2, A3) with a respective input (13, 17) and output (15, 19), wherein the output (19) of the first amplifier (A1) is connected to the input (17) of the second amplifier (A3) at a node K3, wherein the input (13) of the first amplifier (A2) is connected to the node K2, wherein the output (19) of the second amplifier (A3) is connected to a node K4, wherein the amplifier cascade (11) is designed to generate a high signal intensity with low phase rotation over a wide frequency range, a feedback network (F1), wherein the feedback network (F1) is connected to the input (7) of the input stage (A1) at the node K1 and to the output (19) of the second amplifier (A3) at the node K4, wherein the feedback network (F1) is designed to provide a high-value feedback resistance with a parasitic capacitance of less than 0.5 pF, wherein the feedback network (F1) is designed to provide a negative feedback to a structure comprising the input stage (A1) and the amplifier cascade (11), and a signal output (21) that is connected to a node K5, wherein the node K5 is connected to the node K4 or corresponds to the node K4. The invention also relates to a sensor system.
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Inventors:
BUDDEN MATTHIAS (DE)
GEBERT THOMAS (DE)
GEBERT THOMAS (DE)
Application Number:
PCT/EP2023/074074
Publication Date:
April 25, 2024
Filing Date:
September 01, 2023
Export Citation:
Assignee:
WIREDSENSE GMBH (DE)
International Classes:
H03F1/26; G01J5/34; H01L25/00; H03F1/34; H03F3/08; H03F3/343; H03F3/345; H03F3/347; H03F3/45; H03F3/50; H03F3/70; H05K1/00; H05K1/02
Foreign References:
| US20140132342A1 | 2014-05-15 | |||
| US5521555A | 1996-05-28 | |||
| US4888562A | 1989-12-19 | |||
| EP0921715A1 | 1999-06-09 | |||
| US20060018104A1 | 2006-01-26 |
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