Self-bias and digitally tunable conduction angle circuits...

Details Self-bias and digitally tunable conduction angle circuits... Self-bias and digitally tunable conduction angle circuits...

2007-05-22

2007-05-22

Shingleton, Michael B (Department: 2817)

Amplifiers

Signal feedback

In cascade amplifiers

C330S277000, C330S310000, C330S311000, C330S259000, C330S261000, C330S254000, C330S278000, C330S253000, C330S285000, C330S296000

Reexamination Certificate

active

10600043

ABSTRACT:
A differential RF non-linear power amplifier employing low-voltage transistors in a cascode configuration uses self-biasing solutions rather than external biasing techniques to overcome transistor breakdown problems. The self-biasing solution ensures that the cascode devices and driver device operate below breakdown voltage limitations. A low resistance circuit is placed in parallel with the self-biased circuitry to mitigate increased on-resistance created by the self-biasing solution. PMOS and NMOS inverter legs provide digital programming of the conduction angle for the power amplifier. Changing the PMOS and NMOS strengths in the chain of inverter legs changes the conduction angle.

REFERENCES:
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patent: 5426641 (1995-06-01), Afrashteh et al.
patent: 6542037 (2003-04-01), Noll et al.
patent: 3622877704 (1987-12-01), None
Millman “Microelectronics Digital and Analog Circuits and Systems” McGraw-Hill Book Company Copyright 1979 p. 254.
T. Sowlati and D. Leenaerts, “A 2.4 GHz 0.18 um CMOS Self-Biased Cascode Power Amplifier with 23dBm Output Power,”IEEE International Solid-State Circuits Conference 2002 Technical Digest, Feb. 2002, pp. 285,294,295,467.

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