Switched capacitor charge pump and sawtooth oscillator using sam

Details Switched capacitor charge pump and sawtooth oscillator using sam Switched capacitor charge pump and sawtooth oscillator using sam

1994-03-22

1995-02-07

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331143, 327 77, 327131, H03K 3023, H03K 3354

Patent

active

053878825

ABSTRACT:
Charge pump including: a capacitor (4) which includes a first capacitor terminal (2) and a second capacitor terminal (8), a discharge switch (20) for discharging the capacitor (4) by the closing and opening of the discharge switch (20) in response to a first or second value respectively, of a clock signal (CS), a first current source (6) for supplying a first current (I1) to the first capacitor terminal (2), a comparator (12) whose first input (10) is connected to the first capacitor terminal (2) and whose second input (14) is connected to a reference voltage source (16) and which comparator generates a comparison signal (Vcomp) of which a first or second value denotes that the voltage (Vc) on the first input (10) is smaller or larger than the voltage on the second input (14), a current switch (24) passing a second current (I2) coming from the second current source (34) to an output terminal (28) once the clock signal (CS) has changed from the first to the second value, and prevents the second current (I2) flowing to the output terminal (28) once the comparison signal (Vcomp) has changed from the first to the second value. A sawtooth oscillator is formed by using the charge pump as a timing circuit with the oscillator providing the clock signal, and the second current from the output terminal being fed back to the first capacitor terminal.

REFERENCES:
patent: 4644300 (1987-02-01), Ibe et al.
patent: 4792705 (1988-12-01), Ouyang et al.
IEEE, vol. 71, No. 8, Aug. 1983, pp. 941-965, R. Gregorian et al., "Switched-Capacitor Circuit Design".
U. Tietze Ch. Schenk `Halbleiter-Schaltungstechnik` 1980, Springer Verlag Berlin Heidelberg N.Y., pp. 444-450.

Affiliated with

Also associated with

Rating

Switched capacitor charge pump and sawtooth oscillator using sam does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Switched capacitor charge pump and sawtooth oscillator using sam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switched capacitor charge pump and sawtooth oscillator using sam will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1113086