Phase shifter and current mode mixer
First Claim
1. An integrated circuit radio transceiver, comprising:
- a baseband processor operable to process ingoing digital communication signals and to produce outgoing digital communication signals;
a transmitter front end operable to process and transmit outgoing RF signals based upon the outgoing digital communication signals;
a receiver front end operable to receive ingoing RF signals and to process the ingoing RF signals to produce the ingoing digital communication signals to the baseband processor; and
an integrated phase shift mixer for generating a phase and frequency shifted output signal to at least a portion of one of the transmitter and receiver front ends, the integrated phase shift mixer further including;
a phase shift block operable to produce a phase shifted current signal at an output of the phase shift block; and
a mixing block operable to produce the phase and frequency shifted output current signal based upon the phase shifted current signal.
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Accused Products
Abstract
An integrated circuit radio transceiver comprises an integrated phase shift mixer for generating a phase and frequency shifted output signal to at least a portion of one of a transmitter or receiver front end. The integrated phase shift mixer includes a phase shift block that is operable to produce a phase shifted current signal at an output of the phase shift block and a mixer that is operable to produce the phase and frequency shifted output signal based upon the phase shifted current signal. One aspect of the present invention is that the phase shift block produces an output as a current signal and the mixer block is operably disposed and formed to receive the current signal produced by the phase shift block. Thus, the mixer includes a folded cascode mixer that provides a substantially low input impedance.
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Citations
19 Claims
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1. An integrated circuit radio transceiver, comprising:
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a baseband processor operable to process ingoing digital communication signals and to produce outgoing digital communication signals; a transmitter front end operable to process and transmit outgoing RF signals based upon the outgoing digital communication signals; a receiver front end operable to receive ingoing RF signals and to process the ingoing RF signals to produce the ingoing digital communication signals to the baseband processor; and an integrated phase shift mixer for generating a phase and frequency shifted output signal to at least a portion of one of the transmitter and receiver front ends, the integrated phase shift mixer further including; a phase shift block operable to produce a phase shifted current signal at an output of the phase shift block; and a mixing block operable to produce the phase and frequency shifted output current signal based upon the phase shifted current signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An integrated circuit radio receiver, comprising:
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a baseband processor operable to process ingoing digital communication signals and to produce outgoing digital communication signals; a receiver front end operable to receive ingoing RF signals to produce the ingoing digital communication signals to the baseband processor; and an integrated phase shift mixer for generating a phase and frequency shifted output signal to at least a portion of the receiver front end, the integrated phase shift mixer further including; a phase shift block operable to produce a phase shifted current signal at an output of the phase shift block; and a mixer block operable to produce the phase and frequency shifted output signal based upon the phase shifted current signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for phase and frequency shifting an ingoing RF communication signal, comprising:
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receiving non-phase-aligned multi-path signal components of an ingoing communication signal; phase shifting non-phase-aligned multi-path signal components to produce phase-aligned signal current components in the form of phase shifted current signals; summing the phase shifted current signals to produce an ingoing current signal; producing the ingoing current signal to a mixer; and mixing the ingoing current signal with a local oscillation to produce a phase and frequency shifted ingoing signal. - View Dependent Claims (16, 17, 18, 19)
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Specification