Low voltage transceiver

Details Low voltage transceiver Low voltage transceiver

1998-03-23

1999-07-27

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

455127, 455 383, 455116, 455571, 455343, 455334, 3403111, 330 10, H04B 104

Patent

active

059297760

ABSTRACT:
An rf transmitter (319) used with a single cell battery (101) includes a voltage boost circuit (211) integral with a class S amplifier (290). An rf signal to be amplified is separated into its envelope (amplitude) and phase components. The phase component is applied to the input of a power amplifier (260). The envelope is applied to a pulse width modulator (275) which is used to modulate the voltage supplied to the power amplifier (260). The pulse width modulator (275) controls electronic switches (285, 286) which are disposed between the single cell battery (101) and the primary of a step up transformer (211). The secondary of the transformer (211) is coupled to supply voltage to the power amplifier (260). In this manner, the class S amplifier is powered directly from the single cell battery, via a the transformer (211), and power consumption is substantially reduced due to the switching operation of the switches (285, 286).

REFERENCES:
patent: 5590419 (1996-12-01), Shimo
patent: 5781067 (1998-07-01), Tota

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