US3740633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-to-voltage converter device
Assignee: Bull HN Information Systems Italia SpA
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Filing: 1972-02-14
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Granted: 1973-06-19
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Expires: 1992-02-14
Abstract
Abstract A frequency-to-voltage converter for use with such devices as magnetic tape handling equipment is provided having a frequency error signal generator providing pulses, a constant current generator, a capacitor and two switches controlled by the pulses. One of the switches discharges the capacitor within a fixed time interval and the other switch connects the capacitor to the current generator for a time interval determined by the pulses. The capacitor is thus charged to reach a voltage of the next pulse, thereby providing a voltage across the capacitor terminals which is a continuous voltage error signal suitable for control purposes.
Inventors
- 👤 P Buttafava
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:29
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/54; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802; G01P3/56; G01P3/60; G11B15/26; G11B15/28; H; H03; H03K; H03K9/00; H03K9/06; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/933; Y10T; Y10T408/00; Y10T408/16; Y10T408/175
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
A frequency-to-voltage converter device, comprising an input lead for an electric frequency signal having a frequency variable within predetermined limits; circuital timing means comprising a monostable circuit adapted to assume either a first electrical state for a predetermined work time interval, or a second electrical state in rest conditions, said monostable circuit being repetitively set in said first work state by said electrical signal according to the said frequency; a constant current generator; an output capacitor; a first switching means controlled by said monostable circuit, adapted to feed the constant current supplied by said generator to said capacitor during the rest condition of said monostable circuit; an auxiliary pulse generator controlled by said monostable circuit for providing short pulses in coincidence with the reverting of said monostable circuit to the rest condition; a second switching means responsive to said short pulses for short circuiting said capacitor in coincidence to said short pulses.
Claim 2
Dependent Claim
152 words
A frequency-to-voltage converter device, comprising an input lead for an electric frequency signal having a frequency variable within predetermined limits; circuital timing means comprising a monostable circuit adapted to assume either a first electrical state for a predetermined work time interval, or a second electrical state in rest conditions, said monostable circuit being repetitively set in said first work state by said electrical signal according to the said frequency; a constant current generator; an output capacitor; a first switching means controlled by said monostable circuit, adapted to feed the constant current supplied by said generator to said capacitor during the rest condition of said monostable circuit; an auxiliary pulse generator controlled by said monostable circuit for providing short pulses in coincidence with the reverting of said monostable circuit to the rest condition; a second switching means responsive to said short pulses for short circuiting said capacitor in coincidence to said short pulses.
Claim 3
Dependent Claim
59 words
The converter device of claim 1, wherein said circuital timing means comprise an amplifier circuit, a squaring circuit for squaring said electrical frequency signal, and a control pulse generator adapted for supplying control pulses at a repetition rate equal to the frequency of said frequency signal, said control pulses being applied to the input lead of said monostable circuit.
Claim 4
Dependent Claim
42 words
The converter device of claim 2, wherein said constant current generator comprises a transiStor having the emitter connected to a voltage source through a current limiting resistor, the collector connected to said capacitor, and the base connected to a suitable reference voltage.
Claim 5
Dependent Claim
40 words
The converter device of claim 3, wherein said reference voltage is obtained from said voltage source by means of a voltage divider connected at one end to said voltage source, and at the other end to said first switching means.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |