Semiconductor type two phase locked loop filter

Details Semiconductor type two phase locked loop filter Semiconductor type two phase locked loop filter

2007-01-02

2007-01-02

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C327S312000, C327S553000

Reexamination Certificate

active

10722178

ABSTRACT:
There is described a semiconductor Type Two phased locked loop filter having a passive capacitor part and a variable active resistor part, the variable active resistor part being integrated with the passive capacitor part. Integrating an active variable resistor will apply the same change to both poles and has no effect on the loop gain. The variable active resistor part is controlled by a resistor regulator circuit operating from a voltage that follows the type two phased locked loop voltage. The resistor regulator circuit is bootstrapped to the phased locked loop voltage using a voltage follower configured op-amp.

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