Motorola Corporation

Ramon Ponce

Raul Salvi

Armando J Gonzalez

Gustavo Dario Leizerovich

A PIN diode antenna RF switch especially suited for a multi-mode transceiver that includes a full duplex mode such as an AMPS analog mobile telephone. Six PIN diodes ( ) are configured as RF switches which are controlled by an arrangement of four DC switches ( ) to produce a high degree of isolation in a path parallel to a duplexer ( ) and low insertion loss in transmitting modes while optimizing current drain.

Antenna switching circuit

A frequency multiplier (120) having a tunable resonant circuit (122), is anticipated for use with a frequency synthesizer (100) having a Voltage Controlled Oscillator (110). The VCO control line (116) voltage establishes the VCO (110) fundamental frequency (.function.o) as well as the resonant circuit (122) center frequency, such that the resonant circuit (122) frequency response will track a desired harmonic component within the multiplier output (130) even as the VCO control line (116) voltage and the fundamental frequency (.function.o) change in response to control line variation.

Band centering frequency multiplier

A frequency multiplier (120) having a tunable resonant circuit (122), is anticipated for use with a frequency synthesizer (100) having a Voltage Controlled Oscillator (110). The VCO control line (116) voltage establishes the VCO (110) fundamental frequency (.function..sub.o) as well as the resonant circuit (122) center frequency, such that the resonant circuit (122) frequency response will track a desired harmonic component within the multiplier output (130) even as the VCO control line (116) voltage and the fundamental frequency (.function..sub.o) change in response to control line variation.

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Sunrise, FL, United States of America

Ramon Ponce