High input impedance buffer circuit having a high-side current s

Details High input impedance buffer circuit having a high-side current s High input impedance buffer circuit having a high-side current s

1998-12-21

2000-08-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327333, 327491, H03B 100, H03K 300

Patent

active

061007269

ABSTRACT:
A buffer circuit having a high input impedance. The buffer circuit comprises an input lead, a first stage having a first emitter follower transistor and a first level shifter transistor, a second stage having a second emitter follower transistor and a second level shifter transistor, and an output lead coupled to said second stage. The first emitter follower transistor is coupled to the input lead and coupled to the first level shifter transistor. The first and second stage of the buffer circuit acts as a voltage follower. The second emitter follower transistor is coupled to the second level shifter transistor, while the second emitter follower transistor is coupled to the first emitter follower transistor. The buffer circuit has a high input impedance and very low leakage current. Hence, it is ideal for sampling filter components of a phase lock loop circuit within a high frequency clock generation circuit thereby reducing clock jitter.

REFERENCES:
patent: 5278464 (1994-01-01), Pelley, III et al.
patent: 5414382 (1995-05-01), Larson et al.

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