US 7,321,751 B2 | ||
Method and apparatus for improving dynamic range in a communication system | ||
David F Sorrells, Middleburg, Fla. (US); Michael J Bultman, Jacksonville, Fla. (US); Robert W Cook, Switzerland, Fla. (US); Richard C Looke, Jacksonville, Fla. (US); Charley D Moses, Jr., DeBary, Fla. (US); Gregory S Rawlins, Heathrow, Fla. (US); and Michael W Rawlins, Lake Mary, Fla. (US) | ||
Assigned to ParkerVision, Inc., Jacksonville, Fla. (US) | ||
Filed on Nov. 27, 2002, as Appl. No. 10/305,299. | ||
Application 10/305299 is a division of application No. 09/526041, filed on Mar. 14, 2000, granted, now 6,879,817. | ||
Prior Publication US 2003/0181190 A1, Sep. 25, 2003 | ||
Int. Cl. H01Q 11/12 (2006.01) |
U.S. Cl. 455—118 [455/190.1; 455/313; 455/323; 327/119; 327/113] | 22 Claims |
1. An apparatus for improving dynamic range, comprising:
a frequency down-conversion module that receives an input signal; and
a bias circuit comprising:
a first resistor with a first terminal coupled to a bias point and a second terminal coupled to a first voltage reference;
and
a second resistor with a first terminal coupled to said bias point and a second terminal coupled to a second voltage reference;
wherein said bias point is coupled to said input signal;
wherein said frequency down-conversion module comprises a switch and a storage element;
wherein the switch transfers energy from the input signal to the storage element by non-impulse under-sampling the input signal
according to non-impulse pulses of a control signal;
wherein an output signal is generated by integrating the transferred energy;
wherein the bias point is configured to bias the input signal to have a center voltage that varies within a minimum and a
maximum of a voltage range of the control signal; and
wherein said frequency down-conversion module outputs a down-converted output signal.
|