US3737642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Function generating using piecewise linear approximation
Assignee: KROHN HITE CORP
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Filing: 1971-08-09
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Granted: 1973-06-05
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Expires: 1991-08-09
Abstract
Abstract Resistor-diode circuitry approximates converting linear function to a sinusoidal function by piecewise linear segments through progressive clamping with increasing breakpoint level while using a single potential source for each polarity provided by an emitter follower that is arranged to compensate for the diode voltage drop.
Inventors
- 👤 W Kulas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:45
CPC Classifications
H; H03; H03B; H03B28/00; G; G06; G06G; G06G7/00; G06G7/12; G06G7/26; G06G7/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
165 words
Function generating apparatus comprising an input terminal, an output terminal, means including a summing amplifier and a variable resistance intercoupling said input terminal and said output terminal for establishing the gain between said input and output terminal as a function of said variable resistance, said summing amplifier having an input and an output intercoupled by a feedback resistance, said variable resistance comprising, a source of a first fixed potential, a plurality of first resistive means, and a corresponding plurality of first unilaterally conducting devices coupling respective ones of said first resistive means to said source of a first fixed potential and comprising means for clamping the associated resistive meanS to said first fixed potential within associated amplitude ranges of a signal on said input terminal of a first polarity, said variable resistance intercoupling said input terminal and said summing amplifier input to provide a current to the latter input related to the ratio of said first fixed potential to the value of said variable resistance.
Claim 2
Dependent Claim
165 words
Function generating apparatus comprising an input terminal, an output terminal, means including a summing amplifier and a variable resistance intercoupling said input terminal and said output terminal for establishing the gain between said input and output terminal as a function of said variable resistance, said summing amplifier having an input and an output intercoupled by a feedback resistance, said variable resistance comprising, a source of a first fixed potential, a plurality of first resistive means, and a corresponding plurality of first unilaterally conducting devices coupling respective ones of said first resistive means to said source of a first fixed potential and comprising means for clamping the associated resistive meanS to said first fixed potential within associated amplitude ranges of a signal on said input terminal of a first polarity, said variable resistance intercoupling said input terminal and said summing amplifier input to provide a current to the latter input related to the ratio of said first fixed potential to the value of said variable resistance.
Claim 3
Dependent Claim
154 words
Function generating apparatus in accordance with claim 1 wherein said variable resistance further comprises, a source of a second fixed potential, a plurality of second resistive means, and a corresponding plurality of second unilaterally conducting devices coupling respective ones of said second resistive means to said source of a second fixed potential for clamping the associated resistive means to said second fixed potential within associated amplitude ranges of a signal on said input terminal of second polarity opposite said first polarity, said variable resistance providing a current to said summing amplifier input related to the ratio of said first fixed potential to the value of said variable resistance when the potential on said input terminal is of one of the two polarities and related to the ratio of said second fixed potential to the value of said variable resistance when the potential on said input terminal is of the other of the two polarities.
Claim 4
Dependent Claim
78 words
Function generating apparatus in accordance with claim 2 wherein said first and second fixed potentials are of said first and second polarities respectively, each first resistive means is in series with a respective second resistive means, and each of said unilaterally conducting devices is connected between the junction of an associated pair of first and second resistive means in series and an associated one of said potential sources, said first and second unilaterally conducting devices being oppositely poled.
Claim 5
Dependent Claim
30 words
Function generating apparatus in accordance with claim 3 wherein said sources of fixed potentials comprise a pair of emitter followers providing substantially the same potential magnitudes but of opposite polarity.
Claim 6
Dependent Claim
70 words
Function generating apparatus in accordance with claim 4 wherein a first resistance of a pair RA, a second resistance of a pair RB, the potential eb at the junction when a unilaterally conducting device connected thereto just conducts in response to the input potential on said input terminal then being an associated breakpoint potential einn are related by the equations: RS RA + RB, RA RS(1 - eb/einn), RB RSeb/einn.
Claim 7
Dependent Claim
17 words
Function generating apparatus in accordance with claim 5 wherein said pairs of resistances are connected in parallel.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |