US4870366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal generator with programmable variable frequency
Assignee: Societe de Fabrication dInstruments de Mesure SFIM SA
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Filing: 1987-06-23
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Granted: 1989-09-26
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Expires: 2007-06-23
Abstract
Abstract The invention relates to a signal generator with programmable variable frequency and comprises a reference oscillator, a first frequency divider receiving the signal emitted by the reference oscillator and delivering an instantaneous frequency signal (FS). A control chain for said first frequency divider comprises a second frequency divider and a first programmable integrator system, which controls the first frequency divider. A control chain for the second frequency divider comprises a second integrator system receiving the output signal (FS). This signal has an instantaneous frequency of the polynomial form ##EQU1##
Inventors
- 👤 Charlie Pelletier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:05
CPC Classifications
H; H03; H03B; H03B23/00; H03B2200/00; H03B2200/006; H03B2200/0092
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
176 words
A signal generator with variable frequency programmable according to a time-polynomial variation law, comprising: a reference oscillator for generating a reference signal at an arbitrary frequency (FHL), a first frequency divider with a controlled division ratio (N), said first frequency divider receiving said arbitrary frequency reference signal (FHL) and delivering in use an instantaneous frequency output signal (FS), a control chain for said first frequency divider fed by said reference oscillator and comprising, connected in cascade, a second frequency divider with a controlled division ratio and a first programmable integrator system of which the output delivers to said first frequency divider the value of said instantaneous division ratio (N), a control chain for said second frequency divider comprising a second integrator system receiving said output signal (FS) and delivering said instantaneous division ratio to said second frequency divider with a controlled division ratio, said first and second integrator systems carrying out a magnitude integration at a sign (S) opposite to their input signals, said output signal (FS) having an instantaneous frequency of the polynomial form ##EQU22##
Claim 2
Dependent Claim
176 words
A signal generator with variable frequency programmable according to a time-polynomial variation law, comprising: a reference oscillator for generating a reference signal at an arbitrary frequency (FHL), a first frequency divider with a controlled division ratio (N), said first frequency divider receiving said arbitrary frequency reference signal (FHL) and delivering in use an instantaneous frequency output signal (FS), a control chain for said first frequency divider fed by said reference oscillator and comprising, connected in cascade, a second frequency divider with a controlled division ratio and a first programmable integrator system of which the output delivers to said first frequency divider the value of said instantaneous division ratio (N), a control chain for said second frequency divider comprising a second integrator system receiving said output signal (FS) and delivering said instantaneous division ratio to said second frequency divider with a controlled division ratio, said first and second integrator systems carrying out a magnitude integration at a sign (S) opposite to their input signals, said output signal (FS) having an instantaneous frequency of the polynomial form ##EQU22##
Claim 3
Dependent Claim
21 words
A device according to claim 1, wherein said first and second integrator systems are constituted by up and down pulse counters.
Claim 4
Dependent Claim
38 words
A device according to claim 1, including an adjustable circuit means coupled to said first and second frequency dividers and wherein said first and second frequency dividers with controlled division ratios are adjusted by said adjustable circuit means.
Claim 5
Dependent Claim
24 words
A device according to claim 1, wherein said first and second frequency dividers with controlled division ratios include at least one adjustable circuit divider.
Claim 6
Dependent Claim
62 words
A device according to claim 1, wherein said first and second integrator systems carry out magnitude integration at the sign (S) of their input signals permitting, as a function of the choice of said sign (S), a change of said polynomial variation law for said output frequency (FS) by values respectively increasing and decreasing said variable frequency as a function of time.
Claim 7
Dependent Claim
51 words
A device according to claim 1, further comprising a comparison loop for said value of said instantaneous frequency (FS) of said output signal with a programmable threshold value, said comparison loop permitting on positive comparison of said value of instantaneous frequency (FS) with said threshold value a resetting of said system.
Claim 8
Dependent Claim
100 words
A device according to claim 1, wherein in order to generate a sinusoidal wave form at variable frequency according to a time-polynomial variation law, said device further comprises, connected to an output of said first frequency divider with a controlled division ratio, a bistable circuit permitting generation from said output signal at frequency (FS) a rectangular signal of the same instantaneous frequency, a harmonic frequency filter tuned to a fundamental frequency of said rectangular signal connected to an output of said bistable circuit for delivering a signal, the frequency of which corresponds to the first harmonic of said rectangular signal.
Claim 9
Dependent Claim
17 words
A device according to claim 1, wherein it is provided in the form of an integrated circuit.
Claim 10
Dependent Claim
32 words
Use of a variable frequency signal generator according to claim 1, for control of motors, wherein control parameters are memorised in auxiliary memories interconnected by a BUS type connection to a micro-computer.
Claim 11
Dependent Claim
64 words
Use according to claim 9, wherein in order to control a stepper motor, a speed control law for the motor is used, said speed control law employing counting of the total number of steps made, counting of the maximum frequency of steps, control in rising and fall of speed of said stepper motor being carried out by changing the sign of said integrator systems.
Claim 12
Dependent Claim
20 words
A device according to claim 1, wherein said reference oscillator is a pulse generator at a quartz-controlled, fixed recurrence frequency.
Claim 13
Dependent Claim
39 words
A device according to claim 11, wherein said second frequency divider comprises, connected in cascade, a first frequency divider circuit with a determined adjustable division ratio (A) and a second frequency divider circuit with a controlled division ratio (B).
Claim 14
Dependent Claim
32 words
A device according to claim 11, wherein said instantaneous frequency (FS) of said output signal is defined as the reciprocal of the time separating two pulses delivered by said first frequency divider.
Claim 15
Dependent Claim
58 words
A device according to claim 12, wherein said first frequency divider circuit with an adjustable division ratio (A) is a programmable divider controlled by an integrator circuit from a reference value, said control of the value of said division ratio A permitting continuous modification of the polynomial variation law for said variable frequency as a function of time.
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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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |