Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synthesizer
Patent
1998-05-29
2000-05-02
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synthesizer
327355, 327357, 327113, 327116, 327362, 327233, 455333, 455326, H04B 128
Patent
active
060577142
ABSTRACT:
A frequency conversion or synthesis circuit including a double balance differential active ring mixer with a current shared active radio frequency (RF) input balun, suitable for use in an RF receiver. The circuit is configured to be coupled to a bias circuit for providing a relatively constant current and a buffer circuit for receiving a signal from a local oscillator (LO) source and generating differential LO signals. The circuit includes an input node for receiving an electronic input signal; a balun circuit including a common gate amplifier having a source, a drain, and a gate, the source being coupled to the input node, the gate being DC coupled to the bias circuit and AC coupled, directly or indirectly, to ground, and to the drain comprising a first differential output; a common source amplifier having a source, a drain, and a gate, the source being DC coupled to ground, the gate being coupled to the bias circuit and the input node, and the drain comprising a second differential output; and a mixer, coupled to the first and second differential outputs and the differential LO signals, for generating differential intermediate frequency outputs. The balun circuit may also be used with other loads.
REFERENCES:
patent: 5060298 (1991-10-01), Waugh et al.
patent: 5826182 (1998-10-01), Gilbert
"The Micromizer: A Highly Linear Variant of the Gilbert Mixer Using a Bisymmetric Class-AB Input Stage," Barrie Gilbert, IEEE Journal of Solid-State Circuits, Sep. 1997, vol. 32, No. 09.
Andrys Paul R.
Thompson Philip H.
Conexant Systems Inc.
Le Dinh T.
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