Self-oscillating mixer circuits, and FMCW radar

Details Self-oscillating mixer circuits, and FMCW radar Self-oscillating mixer circuits, and FMCW radar

1992-10-14

1994-01-18

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Determining distance

With frequency modulation

455321, G01S 1308, H04B 126

Patent

active

052802906

ABSTRACT:
A simple self-oscillating mixer circuit is provided, suitable for forming with an antenna (21) the complete front end of an inexpensive short-range FMCW radar. A modulating signal (40), e.g. from a sweep generator (44), is applied to a control terminal (14) to sweep the RF output (R) of the self-oscillating mixer SOM (10). A cancellation circuit (6 to 9) is connected between the control terminal (14) and an IF output line (13) to remove a corresponding modulation (41) which occurs on the IF line (13) and so to generate a substantially demodulated IF output signal (I). Advantageously a grounded-source MESFET in a feed-back network forms the SOM (10) and has the IF output line (13) taken from its gate. In this case the IF modulation (41) is inverted with respect to the modulating signal (40), and so the cancellation is achieved by adding the modulating signal (40) to the modulated IF output signal (41), e.g. via a resistor network 6 to 8.

REFERENCES:
patent: 3787854 (1974-01-01), Friedman et al.
patent: 3832709 (1974-08-01), Klein et al.
patent: 3896435 (1975-07-01), Constant
patent: 4219779 (1980-08-01), Shinkawa et al.
patent: 4682175 (1987-07-01), Lazarus
patent: 4857935 (1989-08-01), Bates

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