CMOS single-ended frequency doubler

Details CMOS single-ended frequency doubler CMOS single-ended frequency doubler

2007-01-16

2007-01-16

Pascal, Robert (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S053000, C331S056000

Reexamination Certificate

active

10973277

ABSTRACT:
A CMOS single-ended frequency doubler with improved subharmonic rejection and low phase noise which allows a single ended reference signal to be utilized in a Balanced Colpitts oscillator. The input is reproduced with a 180-degree phase shift for the opposite Colpitts transistor. This is achieved by adding two PMOS transistors. One transistor is placed as a follower, which reproduces any voltage shift applied to its gate to its source. Another transistor is a matching transistor for balance. By applying the single-ended signal to the gate of the follower transistor, it is reproduced at the source. The rest of the circuit takes advantage of the summing of two period currents with a 180-degree phase shift. The present invention achieves superior performance for frequency doubling due to the squaring of the gate voltage in the corresponding drain current. As a result, the double frequency component is further enhanced.

REFERENCES:
patent: 6181216 (2001-01-01), Waight
patent: 6249190 (2001-06-01), Rozenblit et al.
patent: 6326854 (2001-12-01), Nicholls et al.
patent: 6621363 (2003-09-01), Park et al.
patent: 6707344 (2004-03-01), Cargill et al.
patent: 2004/0113707 (2004-06-01), Fredriksson

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