Claims
- 1. A pulse signal generator comprising a plurality of stages of delay gates connected in series for receiving an input pulse signal and generating a delayed output pulse signal, each stage consisting of a differential connection circuit and an emitter follower circuit, and having a signal delay time which is changed by varying a voltage that controls a value of the current flowing in a current sink of said differential connection circuit and that in a current sink of said emitter follower circuit, said pulse signal generator further comprising:
- a delay time signal generating circuit receiving said input and output pulse signals for forming a comparison pulse signal of a pulse duration corresponding to the delay time between said input and output pulse signals;
- a reference pulse signal generating circuit for forming, on the basis of a time constant of a capacitor and a resistor, a reference else signal of a pulse duration corresponding to a delay time of the input pulse signal derived from the passage thereof through a predetermined number of said delay gates; and
- a correction voltage generating circuit for forming a DC voltage corresponding to the difference between the pulse duration of said comparison pulse signal and that of said reference pulse signal;
- wherein the voltage for controlling the value of the current flowing in the current sink of each said differential connection circuit is supplied separately from the voltage for controlling the value of the current flowing in the current sink of each said emitter follower circuit, and the DC correction voltage outputted from said correction voltage generating circuit is supplied to the current sink of at least one of said emitter follower circuits to change the value of the current in the current sink, thereby controlling the delay time per stage of said delay gates.
- 2. The pulse signal generator according to claim 1, wherein each of said differential connection circuits has an individual current sink circuit, and means for connecting a voltage to a control input of each of said current sink circuits for said differential connection circuits.
- 3. The signal generator according to claim 1, wherein each of said emitter follower circuits comprise a pair of transistors having their inputs connected to outputs of one of said differential connection circuits, and each of said transistors being provided with an individual current sink, and means for connecting a voltage to the control inputs of each of said current sinks of said emitter follower circuits.
- 4. The pulse signal generator according to claim 1, said delay time signal generating circuit including a bistable element connected to receive said input signal which is supplied to the first of said stages, said bistable element producing said comparison signal at an output thereof, and said bistable element being reset by a signal connected from the last of said stages, whereby said bistable element produces a comparison signal having a pulse duration corresponding to the delayed time of the input pulse signal caused by passing the same through a predetermined number of said delay gates.
- 5. Apparatus according to claim 1, wherein said reference pulse signal generating circuit comprises a monostable multivibrator, having its input connected to a signal supplied as an input to the first of said plurality of stages, whereby said reference pulse signal is produced having a pulse duration corresponding to a time constant of said monostable multivibrator.
- 6. The pulse signal generator according to claim 1, wherein said correction voltage generating circuit comprises means for deriving a difference between said comparison signal and said reference pulse signal with a sign of said DC voltage corresponding to whether the length of said comparison signal exceeds that of said reference pulse signal, or vice versa.
- 7. The pulse signal generator according to claim 6, wherein said correction voltage generating circuit comprises subtraction means, said subtraction means having a noninverting input connected to receive said comparison signal, and an inverting input connected to receive said reference pulse signal.
- 8. The pulse signal generator according to claim 7, including a low pass filter connected to the output of said subtraction means, whereby said DC voltage is proportional to an average of a difference between a pulse duration of said comparison pulse signal and that of said reference pulse signal.
Priority Claims (3)
Number |
Date |
Country |
Kind |
2-409770 |
Dec 1990 |
JPX |
|
3-23952 |
Jan 1991 |
JPX |
|
3-23953 |
Jan 1991 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 803,992, filed Dec. 9, 1991.
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3712994 |
Graziani |
Jan 1973 |
|
4618788 |
Backes et al. |
Oct 1986 |
|
4782246 |
Kuroyanagi et al. |
Nov 1988 |
|
5146121 |
Searles et al. |
Sep 1992 |
|
5159205 |
Gorecki et al. |
Oct 1992 |
|
Divisions (1)
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Number |
Date |
Country |
Parent |
803992 |
Dec 1991 |
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