Motorola Corporation

John Ley

Thomas A Freeburg

Gary D Schulz

Paul Odlyzko

Willy Gehardt

Anne M Pearce

Irvin Riley Jackson, Ii

A wide bandwidth frequency discriminator circuit (200) employs a wide bandwidth limiting amplifier (202) to amplify the IF signal portion of a received RF signal. A frequency-to-voltage circuit 208 is provided having a bandwidth substantially greater than the bandwidth of the IF signal. This discriminator (200) operates to form a detection system capable of discriminating between desired and undesired components of the received RF signal even when said desired and undesired components are nearly identical in amplitude. This is due in part to the enhanced frequency response provided by the discriminator (200).

Wide bandwidth discriminator for use in a radio receiver

A frequency-locked loop (100) employs a controllable oscillator (102) for generating an output signal having a frequency, optional sampler (104), coupled to oscillator (102), for sampling the frequency of the output signal, a divider (106), coupled to optional sampling circuit (104), for dividing the output signal frequency to generate a prescaled signal and a microprocessor (108), coupled between the divider 106 and oscillator (102), for comparing the prescaled signal to a reference signal and generating a control signal for correcting frequency shifts based upon the comparison. The control signal generated by microprocessor (108) is non-continuous. During that time when microprocessor (108) generates no control signals, power is removed from various frequency-locked loop circuitry.

Frequency locked-loop using a microcontroller as a comparator

An intelligent communcations node is capable of dynamically selecting frequency and time slot assignments for communications with remote communication devices having different communication protocols including different available frequencies and time slots in a TDMA system. A frequency agile transmitter and receiver combined with an adaptable time slot selector enables communications with remote devices utilizing different protocols. The time and frequency management capabilities of the node makes greater spectral efficiencies possible.

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McHenry, IL, United States of America

John Ley