Low-voltage radio frequency amplifier

Details Low-voltage radio frequency amplifier Low-voltage radio frequency amplifier

1997-11-20

1999-07-27

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

330301, H03F 304

Patent

active

059297085

ABSTRACT:
A power-conserving, linear and broad band RF amplifier, suitable for use at more than one band in the ultra-high frequency regions allotted to radiotelephone transceivers, employs an emitter-follower output transistor to deliver the nominal 1.0 milliwatt RF power to a single-ended load from a low voltage battery, typically 2.7 v. dc, without the use of output coupling transformers. The amplifier receives only a small differential input signal from the preceding mixer or multiplier stage having a typical peak-to-peak magnitude of 0.3 v. The differential input signal is applied to the emitters of a pair of transistors whose bases are interconnected, one transistor of which (B6) is diode-connected in a current-mirror configuration and the other (B5) of which is configured in a common-base connection with emitter degeneration. The signals are summed at the collector of the common-base transistor to deliver a substantial voltage swing, illustratively 1.7 volts peak to peak, which is large enough to drive the base of the emitter-follower output transistor (B3) without requiring the high standby current in the emitter-follower normally required to maintain an emitterfollower in Class A operation.

REFERENCES:
patent: 4485352 (1984-11-01), Davies et al.
patent: 5337010 (1994-08-01), Nishiyama

Affiliated with

Also associated with

Rating

Low-voltage radio frequency amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low-voltage radio frequency amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-voltage radio frequency amplifier will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-883444