Circuit for measuring the level of an electrical signal and including offset correction means, and application thereof to amplifiers having automatic gain control
First Claim
1. A measurement circuit for measuring the level of an input electrical signal, the circuit comprising an input amplifier biased from a bias voltage, receiving said input signal, and producing an output signal, followed by a detector module itself followed by an integrator delivering an integration signal, these three components constituting a measurement channel, said integration signal being the sum of an offset signal and of a level signal which is proportional to the level of said input signal, said measurement circuit further including a generator producing a reference voltage, a compensation module receiving said reference voltage and producing a compensation signal, and a differential measurement amplifier receiving said integration signal and said compensation signal and producing a measurement signal, wherein said bias voltage is constituted by said reference voltage, and wherein said compensation module comprises stages corresponding to said components of said measurement channel for conveying said reference voltage through conditions that match the conditions of said measurement channel, thereby producing, in particular, a correction signal having the same value as said offset signal, said correction signal being included in said compensation signal.
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Abstract
A measurement circuit for measuring the level of an input electrical signal, the circuit comprising an input amplifier biased from a bias voltage, receiving the input signal, and producing an output signal, followed by a detector module itself followed by an integrator delivering an integration signal, these three components constituting a measurement channel, the integration signal being the sum of an offset signal and of a level signal which is proportional to the level of the input signal. The measurement circuit further includes a generator producing a reference voltage, a compensation module receiving the reference voltage and producing a compensation signal, and a differential measurement amplifier receiving the integration signal and the compensation signal and producing a measurement signal, wherein the bias voltage is constituted by the reference voltage, and wherein the compensation module comprises stages corresponding to the components of the measurement channel for conveying the reference voltage through conditions that match the conditions of the measurement channel, thereby producing, in particular, a correction signal having the same value as the offset signal, the correction signal being included in the compensation signal.
43 Citations
15 Claims
- 1. A measurement circuit for measuring the level of an input electrical signal, the circuit comprising an input amplifier biased from a bias voltage, receiving said input signal, and producing an output signal, followed by a detector module itself followed by an integrator delivering an integration signal, these three components constituting a measurement channel, said integration signal being the sum of an offset signal and of a level signal which is proportional to the level of said input signal, said measurement circuit further including a generator producing a reference voltage, a compensation module receiving said reference voltage and producing a compensation signal, and a differential measurement amplifier receiving said integration signal and said compensation signal and producing a measurement signal, wherein said bias voltage is constituted by said reference voltage, and wherein said compensation module comprises stages corresponding to said components of said measurement channel for conveying said reference voltage through conditions that match the conditions of said measurement channel, thereby producing, in particular, a correction signal having the same value as said offset signal, said correction signal being included in said compensation signal.
Specification