Dual mode receiver
AssigneeMotorola, Inc.
InventorsJohn Raymond Nelson, James Robert Shaner, Don Reginald Holcomb
Life of this patent
Estimating the term…
Abstract
A transponder including a receiver and a transmitter controlled by the output of the receiver, with the receiver including a first phase locked loop with a mixer and a voltage controlled oscillator supplying an output to a second phase locked loop including a switchable frequency divider connected to supply a low side injection signal to the mixer of the first loop in the first mode of operation and a high side injection signal to the mixer in the second mode of operation.
Claims6
In a transponder including a receiver and a transmitter, apparatus providing dual mode operation of the receiver comprising
- a. a first phase locked loop including a first mixer connected to the receiver for receiving therefrom a signal of a first frequency in a first mode of operation and a signal of a second frequency, different from said first frequency, in a second mode of operation, said first phase locked loop supplying an output signal to control the transmitter;
- b. a second phase locked loop connected to receive the output signal from said first phase locked loop and further connected to supply a low-side injection signal to said first mixer in the first mode of operation and a high-side injection signal to said first mixer in the second mode of operation, said second phase locked loop including switchable frequency divider means for switching said second phase locked loop between the first and the second modes of operation.
Dependencies are inferred from the claim text.