US4507618A
Expired / Lapsed
US
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Compensation method and apparatus for an RC attenuator
Assignee: Tektronix Inc
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Filing: 1982-10-04
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Granted: 1985-03-26
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Expires: 2002-10-04
Abstract
Abstract A compensation method and apparatus for a roughly compensated RC attenuator using fixed resistors and fixed capacitors. Any difference of the high frequency attenuation ratio from the low frequency of DC attenuation ratio is detected and corrected by using multiplier for increasing or decreasing high frequency components at the output from such RC attenuator, thereby allowing digital or remote compensation of RC attenuator without using variable capacitors.
Inventors
- 👤 Theodore G. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:24
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/08; G01R13/00; G01R13/20; G01R13/22; H; H03; H03H; H03H11/00; H03H11/02; H03H11/24
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
63 words
A compensation apparatus for an attenuator having fixed resistors paralleled by fixed capacitors and an input and an output, said compensation apparatus comprising: circuit means for controllably amplifying high frequency components of the output signal from said attenuator; and summing means for algebraically summing the output of said circuit means with the output of said attenuator thereby to provided a frequency compensated output.
Claim 2
Dependent Claim
63 words
A compensation apparatus for an attenuator having fixed resistors paralleled by fixed capacitors and an input and an output, said compensation apparatus comprising: circuit means for controllably amplifying high frequency components of the output signal from said attenuator; and summing means for algebraically summing the output of said circuit means with the output of said attenuator thereby to provided a frequency compensated output.
Claim 3
Dependent Claim
65 words
A compensation apparatus for an attenuator in accordance with claim 1 wherein said summing means comprises a buffer amplifier and said circuit means comprises a four quadrant multiplier for multiplying the output of another buffer amplifier connected to the output of said attenuator and a controllable DC voltage to provide the multiplied output through a coupling capacitor to said buffer amplifier of said summing means.
Claim 4
Dependent Claim
28 words
A compensation apparatus for an attenuator in accordance with claim 2 wherein said controllable DC voltage is generated by digital-to-analog conversion of a digital word from a microprocessor.
Claim 5
Dependent Claim
23 words
A compensation apparatus for an attenuator in accordance with claim 1 further including a buffer amplifier connected to the output of said attenuator.
Claim 6
Dependent Claim
44 words
A compensation apparatus for an attenuator in accordance with claim 1 wherein said circuit means comprises paraphase amplifier coupled to the output of said attenuator to provide a push-pull output and control means for obtaining the sum of said push-pull output in different ratios.
Claim 7
Dependent Claim
80 words
An RC attenuator, comprising: first and second resistors connected in series and shunt relation respectively between input and output terminals and fixed first and second capacitors connected respectively in parallel with said first and second resistors for rough frequency compensation; a third capacitor with one terminal thereof connected to said output terminal; and a multiplier for multiplying the output from said output terminal and a controllable DC voltage to provide the output to the other end of said third capacitor.
Claim 8
Dependent Claim
80 words
An RC attenuator, comprising: first and second resistors connected in series and shunt relation respectively between input and output terminals and fixed first and second capacitors connected respectively in parallel with said first and second resistors for rough frequency compensation; a third capacitor with one terminal thereof connected to said output terminal; and a multiplier for multiplying the output from said output terminal and a controllable DC voltage to provide the output to the other end of said third capacitor.
Claim 9
Dependent Claim
16 words
An RC attenuator in accordance with claim 6 wherein said multiplier is a four quadrant multiplier.
Claim 10
Dependent Claim
16 words
An RC attenuator in accordance with claim 6 wherein said controllable DC voltage is manually controlled.
Claim 11
Dependent Claim
24 words
An RC attenuator in accordance with claim 6 wherein said controllable DC voltage is a digital word from a microprocessor converted into analog value.
Claim 12
Dependent Claim
67 words
A digital compensation circuit for an attenuator, comprising: a roughly compensated RC attenuator including fixed resistors and fixed capacitors forming low and high frequency attenuators; an amplifier for amplifying the output signal from said RC attenuator; and a multiplier for providing the high frequency components in the output from said RC attenuator in controllable gain and polarity in response to a digital word from a digital control.
Claim 13
Dependent Claim
67 words
A digital compensation circuit for an attenuator, comprising: a roughly compensated RC attenuator including fixed resistors and fixed capacitors forming low and high frequency attenuators; an amplifier for amplifying the output signal from said RC attenuator; and a multiplier for providing the high frequency components in the output from said RC attenuator in controllable gain and polarity in response to a digital word from a digital control.
Claim 14
Dependent Claim
66 words
A compensation method for an RC attenuator made of fixed resistors and fixed capacitors, comprising the steps of: comparing the attenuation ratios of said attenuator to low and high frequency input signals; and increasing or decreasing the attenuation ratio to the high frequency input signal until the two attenuation ratios are equalized by adding or subtracting the high frequency comonents to the output from said attenuator.
Claim 15
Dependent Claim
66 words
A compensation method for an RC attenuator made of fixed resistors and fixed capacitors, comprising the steps of: comparing the attenuation ratios of said attenuator to low and high frequency input signals; and increasing or decreasing the attenuation ratio to the high frequency input signal until the two attenuation ratios are equalized by adding or subtracting the high frequency comonents to the output from said attenuator.
Claim 16
Dependent Claim
56 words
A compensation method for an RC attenuator in accordance with claim 11 wherein said increasing or decreasing the attenuation ratio to the high frequency signal is made by applying a digital word to a four quadrant multiplier in such a manner that the difference in the high frequency attenuation ratio reaches the low frequency attenuation ratio.
References Cited (Backward Citations)
US3883832A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |