US5680075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital automatic gain control
Assignee: TRONTECH LICENSING Inc
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Filing: 1995-05-31
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Granted: 1997-10-21
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Expires: 2015-05-31
Abstract
Abstract A digital automatic gain control system includes an envelope detector coupled to a system input for converting an AC input signal into a DC output signal. An analog-to-digital converter has an input coupled to receive the output signal of the envelope detector and an output coupled to a digital register controlled by a digital control circuit. A programmable gain amplifier has control inputs coupled to receive an output of the digital register for controlling the gain of the programmable gain amplifier such that the signal level at a system output of the programmable gain amplifier remains substantially constant as the signal level at the system input varies within a specified dynamic range.
Inventors
- 👤 Frank Sacca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:34
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/001
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
153 words
A digital automatic gain control system having a system input and a system output, comprising: a detector coupled to said system input and for converting an AC input signal into a control output signal; an analog-to-digital converter having an input coupled to receive the control output signal of the detector; said analog-to-digital converter comprising a counter, a digital-to-analog converter coupled to said counter, and a comparator for comparing an output of said digital-to-analog converter with a control signal; and a programmable gain amplifier having an input coupled to receive the AC input signal from the system input, and an output coupled to the automatic gain control system output, and further having control inputs coupled to receive an output of the analog-to-digital converter for controlling the gain of the programmable gain amplifier such that the automatic gain control system output signal level remains substantially constant as the signal level at the system input varies.
Claim 2
Dependent Claim
153 words
A digital automatic gain control system having a system input and a system output, comprising: a detector coupled to said system input and for converting an AC input signal into a control output signal; an analog-to-digital converter having an input coupled to receive the control output signal of the detector; said analog-to-digital converter comprising a counter, a digital-to-analog converter coupled to said counter, and a comparator for comparing an output of said digital-to-analog converter with a control signal; and a programmable gain amplifier having an input coupled to receive the AC input signal from the system input, and an output coupled to the automatic gain control system output, and further having control inputs coupled to receive an output of the analog-to-digital converter for controlling the gain of the programmable gain amplifier such that the automatic gain control system output signal level remains substantially constant as the signal level at the system input varies.
Claim 3
Dependent Claim
44 words
The automatic gain control system of claim 1, further comprising: a non-linear amplifier coupling the system input to the input of the detector; and wherein the programmable gain amplifier has a control law which is an inverse function of that of the non-linear amplifier.
Claim 4
Dependent Claim
44 words
The automatic gain control system of claim 1, further comprising: a non-linear amplifier coupling the output of the detector to the analog-to-digital converter; and wherein the programmable gain amplifier has a control law which is an inverse function of that of the non-linear amplifier.
Claim 5
Dependent Claim
19 words
The automatic gain control system of claim 1, further comprising control means for eliminating noise on a control voltage.
Claim 6
Dependent Claim
20 words
The automatic gain control system of claim 4, wherein said control means comprises a magnitude comparator and a digital counter.
Claim 7
Dependent Claim
16 words
The automatic gain control system of claim 4, wherein said control means has a transfer function.
Claim 8
Dependent Claim
17 words
The automatic gain control system of claim 1, wherein said analog-to-digital converter has a non-linear transfer function.
Claim 9
Dependent Claim
35 words
The automatic gain control system of claim 1, further comprising a digital register coupled between said analog-to-digital converter and said programmable gain amplifier, and having an output which is updated by a digital control circuit.
Claim 10
Dependent Claim
140 words
An automatic gain control system having an input and an output, comprising: a detector having an input coupled to the automatic gain control output; an analog-to-digital converter having an input coupled to an output of the detector; a control circuit having an input coupled to the output of the analog-to-digital converter; and a programmable gain amplifier having an input coupled to the automatic gain control input and an output coupled to the automatic gain control output, and control inputs coupled to an output of the control circuit; said analog-to-digital converter comprising a counter, a digital-to-analog converter coupled to said counter, and a comparator for comparing an output of said digital-to-analog converter with a control signal; and wherein the automatic gain control output signal level remains substantially constant as the automatic gain control input level varies within a specified dynamic range.
Claim 11
Dependent Claim
140 words
An automatic gain control system having an input and an output, comprising: a detector having an input coupled to the automatic gain control output; an analog-to-digital converter having an input coupled to an output of the detector; a control circuit having an input coupled to the output of the analog-to-digital converter; and a programmable gain amplifier having an input coupled to the automatic gain control input and an output coupled to the automatic gain control output, and control inputs coupled to an output of the control circuit; said analog-to-digital converter comprising a counter, a digital-to-analog converter coupled to said counter, and a comparator for comparing an output of said digital-to-analog converter with a control signal; and wherein the automatic gain control output signal level remains substantially constant as the automatic gain control input level varies within a specified dynamic range.
Claim 12
Dependent Claim
54 words
The automatic gain control system of claim 9, further comprising: a non-linear amplifier having an input coupled to the automatic gain control output and an output coupled to the input of the detector; and wherein the programmable gain amplifier has a control law which is an inverse function of that of the non-linear amplifier.
Claim 13
Dependent Claim
47 words
The automatic gain control system of claim 9, further comprising: a non-linear amplifier coupling the output of the detector to the input of the analog-to-digital converter; and wherein the programmable gain amplifier has a control law which is an inverse function of that of the non-linear amplifier.
Claim 14
Dependent Claim
19 words
The automatic gain control system of claim 9, further comprising control means for eliminating noise on a control voltage.
Claim 15
Dependent Claim
20 words
The automatic gain control system of claim 12, wherein said control means comprises a magnitude comparator and a digital counter.
Claim 16
Dependent Claim
16 words
The automatic gain control system of claim 12, wherein said control means has a transfer function.
Claim 17
Dependent Claim
17 words
The automatic gain control system of claim 9, wherein said analog-to-digital converter has a non-linear transfer function.
Claim 18
Dependent Claim
34 words
The automatic gain control system of claim 9, further comprising a digital register coupled between said analog-to-digital converter and said programmable gain amplifier, and having an output which is updated by said control circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-10-20 | 2001-04-21 | 2001-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-20 | 2005-04-21 | 2005-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-20 | 2009-04-21 | 2009-10-21 | $7700.00 | Window Closed / Lapsed |