US3610952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triangle wave generator
Assignee: Electro Optical Ind Inc
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Filing: 1970-04-07
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Granted: 1971-10-05
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Expires: 1990-04-07
Abstract
Abstract A waveform converter for automatically producing constant amplitude triangular wave signals from 50-50 square wave signals of varying amplitude and frequency. A variable-resistance device transfers the input signal into a fast integrator circuit that produces a triangle wave signal. A buffer stage removes the DC component and produces a buffered output triangular wave signal. A clipped portion of the output triangular wave signal is combined with a bias reference level. A slow integrator circuit integrates this combined signal and controls the resistance of the variable-resistance device. Negative feedback is provided to the variable resistance so as to increase or decrease the amplitude of the triangular output signal in order to maintain a constant amplitude output signal.
Inventors
- 👤 Robert E Chandos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:07
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/066; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/0047; H03G1/007
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
285 words
Signal-converting apparatus for producing a constantamplitude triangular wave signal from a square wave signal comprising: variable-resistance means having an input and output, and a control input, and the input adapted to receive the square wave input signal, and an attenuated version of the square wave input signal appearing at the output, and the control input for accepting control signals to vary the variable resistance between the input and output; a fast integrator circuit having an input and output, the input connected to the variable-resistance output to integrate the attenuated square wave input signal and produce a fast integrator triangular wave signal at the output; buffer means having an input and an output, the input connected to the fast integrator output for providing at t the a triangular wave output signal comprising a buffered version of the fast integrator triangular wave output signal; clipping means having an input and an output for receiving the triangular wave output signal at the input and presenting at a Clipped signal output in response thereto representing the portion of the triangular wave output signal having an amplitude above a predetermined amplitude; bias means having an output for generating a bias signal at the output; and a slow integrator circuit having an input and output, and the input connected to both the output of the clipping means and the output of the bias means for receiving the bias signal and the clipped signal and generating a control signal at the output, said control signal representing an integrated version of the combined bias signal and clipped signal, and the integrator circuit output connected to provide the control signal for varying the variable resistance in response to to variations in the control signal.
Claim 2
Dependent Claim
285 words
Signal-converting apparatus for producing a constantamplitude triangular wave signal from a square wave signal comprising: variable-resistance means having an input and output, and a control input, and the input adapted to receive the square wave input signal, and an attenuated version of the square wave input signal appearing at the output, and the control input for accepting control signals to vary the variable resistance between the input and output; a fast integrator circuit having an input and output, the input connected to the variable-resistance output to integrate the attenuated square wave input signal and produce a fast integrator triangular wave signal at the output; buffer means having an input and an output, the input connected to the fast integrator output for providing at t the a triangular wave output signal comprising a buffered version of the fast integrator triangular wave output signal; clipping means having an input and an output for receiving the triangular wave output signal at the input and presenting at a Clipped signal output in response thereto representing the portion of the triangular wave output signal having an amplitude above a predetermined amplitude; bias means having an output for generating a bias signal at the output; and a slow integrator circuit having an input and output, and the input connected to both the output of the clipping means and the output of the bias means for receiving the bias signal and the clipped signal and generating a control signal at the output, said control signal representing an integrated version of the combined bias signal and clipped signal, and the integrator circuit output connected to provide the control signal for varying the variable resistance in response to to variations in the control signal.
Claim 3
Dependent Claim
51 words
The signal-converting apparatus of claim 1 wherein: the fast integrator circuit comprises a phase-inverting amplifier and a capacitor connected between the phase-inverting amplifier input and output; the buffer means comprises a DC linear amplifier; and the slow integrator comprises a phase-inverting amplifier and a capacitor connected between the input and output.
Claim 4
Dependent Claim
42 words
The signal converting apparatus of claim 2 wherein: the clipping means comprises a zener diode; the bias means comprises a potentiometer adapted to receive a source of DC power and having the wiper element connected to the input of the slow integrator.
Claim 5
Dependent Claim
59 words
The signal converting apparatus of claim 3 wherein: the variable-resistance means comprises a light-sensitive variable resistor; and the slow integrator circuit includes a light bulb connected between the integrator circuit output and ground potential for receiving the control signal and varying the light output in response thereto and positioned to illuminate the light-sensitive variable resistor with said light output.
Claim 6
Dependent Claim
22 words
The signal-converting apparatus of claim 3 wherein the variable-resistance means comprises at least one field-effect transistor having drain, source and gate terminals.
Claim 7
Dependent Claim
53 words
The signal-converting apparatus of claim 5 wherein: the drain terminal of the field-effect transistor is connected to the input square wave signal, the source terminal is connected to the input of the fast integrator circuit, and the gate input is connected to the output of the slow integrator for receiving the control signal.
Claim 8
Dependent Claim
70 words
The signal-converting apparatus of claim 5 wherein: two resistors are connected in series to the fast integrator circuit input; the drain terminal of the field-effect transistor is connected to the common junction of the series resistors; the source terminal of the field-effect transistor is connected to ground potential; and the gate terminal of the field-effect transistor is connected to the output of the slow integrator for receiving the control signal.
Claim 9
Dependent Claim
102 words
The signal converting apparatus of claim 4 wherein the variable-resistance comprises: a first and second field-effect transistor; a resistor with one side of the resistor connected to receive the square wave signal input; the drain terminals of the first and second field-effect transistors connected to the other side of the resistor; the source terminal of the first field-effect transistor is connected to ground potential; the source terminal of the second field-effect transistor connected to the fast integrator circuit input; and the gate terminals of the first and second field-effect transistors coupled to the slow integrator circuit output for receiving the control signal.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |