CMOS transceiver for communication system
First Claim
Patent Images
1. A transceiver for use in an communication system, comprising:
- a plurality of phase-locked loops (PLLs), each of the PLLs providing a signal at a different frequency;
a plurality of mixers, each of the mixers configured to mix the signal generated from a corresponding PLL of the plurality of PLLs with a radio frequency signal to thereby downconvert the radio frequency signal to baseband;
a low noise amplifier having a cascode common gate stage, receiving the radio frequency signal and providing a plurality of amplified radio frequency signals to the plurality of mixers, whereineach of the plurality of amplified radio frequency signals being provided to a corresponding one of the plurality of mixers, the low noise amplifier including a corresponding plurality of amplifiers each coupled to a resonant tank and selectively activated by a selection signal; and
gate circuitry responsive to the selection signal, the gate circuitry gating the signals provided by the PLLs such that only the signal from a single PLL is provided to one mixer at a given time.
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Abstract
A direct conversion ultrawideband transceiver employing three phase locked loops (PLLs). The PLLs are preferably fixed-frequency PLLs that operate continuously, at different frequencies, with a selected frequency determined by selecting the output of one of the three PLLs. The use of three PLLs is suitable for use in a communication system employing frequency hopping across three bands or sub-bands.
14 Citations
13 Claims
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1. A transceiver for use in an communication system, comprising:
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a plurality of phase-locked loops (PLLs), each of the PLLs providing a signal at a different frequency; a plurality of mixers, each of the mixers configured to mix the signal generated from a corresponding PLL of the plurality of PLLs with a radio frequency signal to thereby downconvert the radio frequency signal to baseband; a low noise amplifier having a cascode common gate stage, receiving the radio frequency signal and providing a plurality of amplified radio frequency signals to the plurality of mixers, wherein each of the plurality of amplified radio frequency signals being provided to a corresponding one of the plurality of mixers, the low noise amplifier including a corresponding plurality of amplifiers each coupled to a resonant tank and selectively activated by a selection signal; and gate circuitry responsive to the selection signal, the gate circuitry gating the signals provided by the PLLs such that only the signal from a single PLL is provided to one mixer at a given time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A transceiver for use in an communication system communicating data over three frequency sub-bands in a frequency hopping manner, comprising:
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three phase-locked loops (PLLs) each providing a mixing signal at a different frequency; a low noise amplifier having a cascode common gate stage, receiving a radio frequency (RF) signal and providing three amplified RF signals to three direct downconvert mixers, wherein each of the three amplified RF signals being provided to a corresponding one of the three direct downconvert mixers, the low noise amplifier including a corresponding plurality of amplifiers each coupled to a resonant tank and selectively activated by a sub-band select signal; the three direct downconvert mixers each receiving an amplified RF signal and a the mixing signal from a corresponding one of the three PLLs; and means for gating the mixing signals from the PLLs responsive to the sub-band select signal such that only one of the three direct downconvert mixers receives the mixing signal from the PLLs at a selected time. - View Dependent Claims (9)
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10. A transceiver for use in an communication system, comprising:
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a low noise amplifier having a cascode common gate stage, receiving a radio frequency (RF) signal and providing a plurality of amplified RF signals each in a separate sub-band to a plurality of mixers, wherein each of the plurality of amplified RF signals being provided to a corresponding one of the plurality of mixers, the low noise amplifier including a corresponding plurality of amplifiers each coupled to a resonant tank and selectively activated by the sub-band selection signal; the plurality of mixers, with a mixer for each sub-band used in the communication system, each of the plurality of mixers receiving a representation of the amplified RF signal and configured to receive a mixing signal for direct downconversion of signals in one of the sub-bands used in the communication system; a plurality of phase-locked loops (PLLs), with a PLL for each sub-band used in the communication system, each of the PLLs generating a mixing signal for direct downconversion of signals in one of the sub-bands used in the communication system; and means for gating the mixing signals responsive to a sub-band selection signal such that only a single mixer downconverts a representation of the amplified RF signal. - View Dependent Claims (11, 12, 13)
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Specification