Controllable current source for a phase locked loop

Details Controllable current source for a phase locked loop Controllable current source for a phase locked loop

2007-04-17

2009-02-24

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S148000

Reexamination Certificate

active

07495485

ABSTRACT:
The invention concerns a controllable current source or “charge pump” (12) in an integrated circuit, comprising two supply terminals (K1,K2) for the application of two supply potentials (V1,V2) as well as an output terminal (Kout) for the delivery of an output current, connected via a first controllable current path (T1) with the first supply terminal (K1), and via a second controllable current path (T2) with the second supply terminal (K2). In order to improve the current source (12) with regard to the quality of the output signal, it is provided according to the invention that the controllable current source (12) furthermore has a replica (T1′,T2′) of the current paths (T1,T2) in their non-controlled state, of which a replica output terminal (Kout′) is connected via a current mirror (T5to T8) with the output terminal (Kout).

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