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AssigneeConexant Systems, Inc.
InventorsPaul R. Andrys, Philip H. Thompson
Estimating the term…
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.
A circuit comprising a double balance differential active ring mixer with a current shared active input balun, the circuit being 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 including:
The receiver circuit of clam 1, wherein the balun circuit provides voltage gain to the input signal before the signal is output to the mixer through the first and second outputs.
An active balun circuit for transforming a radio frequency (RF) signal from an unbalanced signal into a pair of 180 degree part differential signals the circuit including:
A balun circuit comprising:
Dependencies are inferred from the claim text.