US3824410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency to voltage converter with means for prescribing pulse width against fluctuations
Assignee: Canon Anelva Corp
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Filing: 1972-06-20
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Granted: 1974-07-16
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Expires: 1992-06-20
Abstract
Abstract In a frequency to voltage converter, the height of pulses produced in response to the respective cycles of the input signal is stabilized by prescribing the pulse levels with reference to ground and by compensating for the temperature dependency of the characteristics of the circuit elements. Furthermore, the pulse width is prescribed by a predetermined number of cycles of a crystal controlled oscillation. A high gain feedback loop including the converter and a voltage controlled crystal oscillator serves to sweep the frequency of the voltage controlled oscillation in linear proportion to the sweep voltage applied to the loop and to phase synchronize the oscillation with respect to a reference oscillation supplied to the loop. The frequency swept oscillation is applicable to a nuclear magnetic resonance analyser without the offset oscillation.
Inventors
- 👤 H Funaki
- 👤 T Tanaka
- 👤 K Nakajima
- 👤 Y Kanda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:59
CPC Classifications
H; H03; H03B; H03B23/00; H03K; H03K9/00; H03K9/06; H03B2200/00; H03B2200/006; H03B2200/0092
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
196 words
A frequency-to-voltage converter for producing an output signal having a voltage corresponding to the frequency of an input signal comprising: first means for receiving said input signal and producing a first pulse train in accordance with the frequency thereof; a line for connection to a direct current power supply, and a load connected to said line to provide a voltage drop; second means connected to said first means to receive said first pulse train and connected to said load to receive said direct current for producing a second pulse train having an approximately predetermined width; third means for prescribing the amplitude of said second pulse train with reference to the voltage level of said direct current, said third means comprising a Zener diode connected to said power supply line in parallel with said load; differentiation circuit means connected to said third means to receive said amplitude prescribed second pulse train for producing a differential output; fourth means for insulating the converter from the effects of temperature variations comprising a silicon diode interconnected between said power supply lines and said differentiation circuit means; and integrator means connected to said differentiation circuit means for integrating the output thereof.
Claim 2
Dependent Claim
196 words
A frequency-to-voltage converter for producing an output signal having a voltage corresponding to the frequency of an input signal comprising: first means for receiving said input signal and producing a first pulse train in accordance with the frequency thereof; a line for connection to a direct current power supply, and a load connected to said line to provide a voltage drop; second means connected to said first means to receive said first pulse train and connected to said load to receive said direct current for producing a second pulse train having an approximately predetermined width; third means for prescribing the amplitude of said second pulse train with reference to the voltage level of said direct current, said third means comprising a Zener diode connected to said power supply line in parallel with said load; differentiation circuit means connected to said third means to receive said amplitude prescribed second pulse train for producing a differential output; fourth means for insulating the converter from the effects of temperature variations comprising a silicon diode interconnected between said power supply lines and said differentiation circuit means; and integrator means connected to said differentiation circuit means for integrating the output thereof.
Claim 3
Dependent Claim
39 words
A converter according to claim 1, further comprising fifth means for prescribing the amplitude of said differential output with reference to a ground to insulate said differential output from variations in the voltage of said direct current power supply.
Claim 4
Dependent Claim
49 words
A converter according to claim 1, wherein: said differentiation circuit means comprises a resistor and a capacitor, said capacitor having a first electrode connected to said load and a second electrode connected to said resistor; and said fifth means further comprises an additional Zener diode connected across said resistor.
References Cited (Backward Citations)
US3609395A
Cited
US3723765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |