Terahertz phased array system
First Claim
Patent Images
1. An apparatus comprising:
- a local oscillator that generates a local oscillator signal and a pulse signal;
a distribution network that is coupled to the local oscillator so as to at least distribute the local oscillator signal;
a plurality of transceivers, wherein each transceiver has a radiator, a transmit path that is coupled to the radiator, and a receive path that is coupled to the radiator, and wherein the transmit path for each transceiver includes;
a phase shifter is coupled to the distribution network so as to receive the local oscillator signal;
a multiplier that is coupled to the phase shifter so as to receive a phase shifted local oscillator signal;
a injection-locked voltage controlled oscillator (ILVCO) that is coupled to the multiplier; and
a power amplifier (PA) that is coupled to the ILVCO and that receives the pulse signal; and
receiver circuitry that is coupled to the receive path for each of the transceivers.
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Abstract
Microelectronics have now developed to the point where radiation within the terahertz frequency range can be generated and used. Here, an integrated circuit or IC is provided that includes a phased array radar system, which uses terahertz radiation. In order to accomplish this, several features are employed; namely, a lower frequency signal is propagated to transceivers, which multiplies the frequency up to the desired frequency range. To overcome the losses from the multiplication, an injection locked voltage controlled oscillator (ILVCO) is used, and a high frequency power amplifier (PA) can then be used to amplify the signal for transmission.
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Citations
31 Claims
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1. An apparatus comprising:
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a local oscillator that generates a local oscillator signal and a pulse signal; a distribution network that is coupled to the local oscillator so as to at least distribute the local oscillator signal; a plurality of transceivers, wherein each transceiver has a radiator, a transmit path that is coupled to the radiator, and a receive path that is coupled to the radiator, and wherein the transmit path for each transceiver includes; a phase shifter is coupled to the distribution network so as to receive the local oscillator signal; a multiplier that is coupled to the phase shifter so as to receive a phase shifted local oscillator signal; a injection-locked voltage controlled oscillator (ILVCO) that is coupled to the multiplier; and a power amplifier (PA) that is coupled to the ILVCO and that receives the pulse signal; and receiver circuitry that is coupled to the receive path for each of the transceivers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus comprising:
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a local oscillator including; a phase detector that receives a reference signal; a charge pump that is coupled to the phase detector; a low pass filter that is coupled to the charge pump; a local oscillator VCO that generates a first local oscillator signal having that is greater than 40 GHz; a plurality of dividers coupled in series with one another between the local oscillator VCO and the phase detector so as to provide a feedback signal to the phase detector that is generated from the first local oscillator signal, wherein the at least one of the plurality of dividers generates a second local oscillator having a frequency that is greater than 20 GHz; a counter that receives the feedback signal and a control signal; and a pulse generator that receives the second local oscillator signal, that is coupled to the counter, and that generates a pulse signal; a distribution network that is coupled to the local oscillator so as to at least distribute the first local oscillator signal; a plurality of transceivers, wherein each transceiver has a radiator, a transmit path that is coupled to the radiator, and a receive path that is coupled to the radiator, and wherein the radiators are arranged into an array, and wherein the transmit path for each transceiver includes; a phase shifter is coupled to the distribution network so as to receive the first local oscillator signal; a multiplier that is coupled to the phase shifter so as to receive a phase shifted first local oscillator signal; an ILVCO having; a first node; a second node; an inductive network that is coupled between the first and second nodes; a capacitive network that is coupled between the first and second nodes; a first MOS transistor that is coupled to the first node at its source or its drain and to the second node at its gate; a second MOS transistor that is coupled to the second node at its source or its drain and to the first node at its gate; a third MOS transistor that is coupled generally in parallel to the first MOS transistor; a fourth MOS transistor that is coupled generally in parallel to the second MOS transistor; and a balun that is coupled to the first multiplier and the gates of the third and fourth MOS transistors; a PA that is coupled to the ILVCO and its radiator and that receives the pulse signal; and receiver circuitry that is coupled to the receive path for each of the transceivers. - View Dependent Claims (15, 16, 17)
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18. An apparatus comprising:
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a plurality of radiators that are arranged in a pattern for form an array; a local oscillator that generates a local oscillator signal and a pulse signal; a distribution network that is coupled to the local oscillator so as to at least distribute the local oscillator signal; a plurality of transmitter paths, wherein each transmitter path is coupled between the distribution network and at least one of the radiators, and wherein each transmit path includes; a phase shifter is coupled to the distribution network so as to receive the local oscillator signal; a multiplier that is coupled to the phase shifter so as to receive a phase shifted local oscillator signal; an ILVCO that is coupled to the multiplier; and a PA that is coupled to the ILVCO and that receives the pulse signal; and a plurality of receiver paths, wherein each receiver path is coupled to at least one of the radiators; receiver circuitry that is coupled to each receive path; and a controller that is coupled to each phase shifter. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification