EP0126337A2
Expired / Lapsed
EP
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Switched-capacitor AGC system
Assignee: Racal Data Communications Inc
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Filing: 1984-04-27
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Granted: —
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Expires: 2004-04-27
Abstract
Abstract An automatic gain control (AGC) system provides a serial digital output. An analog-to-digital converter implemented by SC technology receives an analog input voltage signal (V jn ) and converts it to a digital word through an iterative algorithmic process involving successive approximation against an input reference voltage (V R ) from a reference voltage generator. The reference voltage generator comprises an SC full-wave rectifier receiving the analog input voltage and an active low-pass filter.
Inventors
- 👤 John A. C. Bingham
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 20:18
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/007; H03M; H03M1/00; H03M1/12; H03M1/34; H03M1/38; H03M1/40; H03M1/403
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
A digital automatic gain control system, comprising: an analog-to-digital converter, for converting an analog input signal to a digital word through an iterative algorithmic process involving successive approximation against an input reference voltage; and a reference voltage generator, for producing the input reference voltage for the analog-to-digital converter, said reference voltage generator receiving the analog input signal applied to the analog-to-digital converter and generating an input reference voltage level as a function of the analog input voltage level.
Claim 2
Dependent Claim
78 words
A digital automatic gain control system, comprising: an analog-to-digital converter, for converting an analog input signal to a digital word through an iterative algorithmic process involving successive approximation against an input reference voltage; and a reference voltage generator, for producing the input reference voltage for the analog-to-digital converter, said reference voltage generator receiving the analog input signal applied to the analog-to-digital converter and generating an input reference voltage level as a function of the analog input voltage level.
Claim 3
Dependent Claim
17 words
The system of claim 1 wherein the reference voltage generator comprises a switched-capacitor (SC) full-wave rectifier circuit.
Claim 4
Dependent Claim
32 words
The system of claim 2 further comprising: a low-pass filter circuit coupled to the SC rectifier circuit and providing a voltage output applied to the analog-to-digital converter as the input reference voltage.
Claim 5
Independent Claim
69 words
A method of digital automatic gain control, comprising the steps of: applying an analog input voltage to be converted to a digital word to a means for generating a DC reference voltage functionally related to the amplitude of the analog input voltage; and applying the analog input voltage and the reference voltage to an iterative algorithmic analog-to digital converter performing the conversion through successive approximation against the reference voltage.
Claim 6
Independent Claim
69 words
A method of digital automatic gain control, comprising the steps of: applying an analog input voltage to be converted to a digital word to a means for generating a DC reference voltage functionally related to the amplitude of the analog input voltage; and applying the analog input voltage and the reference voltage to an iterative algorithmic analog-to digital converter performing the conversion through successive approximation against the reference voltage.
References Cited (Backward Citations)
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