Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control
Patent
1998-08-07
2000-10-31
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Frequency or repetition rate conversion or control
445326, 445237, 445321, H03B 1900
Patent
active
061408492
ABSTRACT:
A linearized double-balanced active mixer circuit is described, including a first input for a local oscillator (LO), a second input for an intermediate frequency (IF) signal, and an output for a resulting product radio frequency (RF) signal. The mixer circuit also includes a feedback circuit, along with a pair of operational amplifiers, for the purpose of improving the intermodulation (IM) performance. According to a further embodiment, the mixer circuit includes a series-shunt feedback amplifier in place of the operational amplifier, and a further embodiment includes an additional pair of transistors to further improve the IM performance. The output of the mixer circuit includes a signal combining circuit, composed of either a network of resistors having two output terminals, or two transformers having a common output terminal.
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Callahan Timothy P.
Nguyen Hiep
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