Capacitor charging circuit with process variation compensation

Details Capacitor charging circuit with process variation compensation Capacitor charging circuit with process variation compensation

1994-10-05

1997-03-18

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327378, 327362, H03K 1714, G11C 2702

Patent

active

056126395

ABSTRACT:
A frequency-responsive integrated circuit (IC) for determining when the frequency of a clock pulse input signal is below a predetermined threshold level, the IC including a capacitor charged up at a nearly constant rate by a current source. If the capacitor voltage reaches one-third of the DC power voltage, and input pulses are received, the capacitor is discharged to start another charge-up cycle. If no input pulses were received, the capacitor continues to charge up until its voltage reaches two-thirds of the DC power voltage, at which point an output signal is produced indicating that the input frequency is below the predetermined threshold level.

REFERENCES:
patent: 4890248 (1989-12-01), Reinhardt
patent: 5059890 (1991-10-01), Yoshikawa et al.
patent: 5109163 (1992-04-01), Benhamida
patent: 5126653 (1992-06-01), Ganesan et al.
patent: 5180926 (1993-01-01), Skripek
patent: 5187389 (1993-02-01), Hall et al.

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