LOOPBACK TECHNIQUES FOR SYNCHRONIZATION OF OSCILLATOR SIGNAL IN RADAR
First Claim
1. A radar apparatus comprising:
- a slave radar chip;
a master radar chip coupled to the slave radar chip, the master radar chip comprising;
a local oscillator configured to generate a transmit signal, wherein the slave radar chip is configured to receive the transmit signal on a first path and configured to send the transmit signal back to the master radar chip on a second path; and
a delay detect circuit coupled to the local oscillator and configured to receive the transmit signal from the slave radar chip on the second path and the transmit signal from the local oscillator, the delay detect circuit configured to estimate a routing delay from the transmit signal received from the slave radar chip on the second path and from the transmit signal received from the local oscillator.
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Accused Products
Abstract
The disclosure provides a radar apparatus for estimating a position and a velocity of a plurality of obstacles. The radar apparatus includes a slave radar chip. A master radar chip is coupled to the slave radar chip. The master radar chip includes a local oscillator that generates a transmit signal. The slave radar chip receives the transmit signal on a first path and sends the transmit signal back to the master radar chip on a second path. A delay detect circuit is coupled to the local oscillator and receives the transmit signal from the slave radar chip on the second path and the transmit signal from the local oscillator. The delay detect circuit estimates a routing delay from the transmit signal received from the slave radar chip on the second path and from the transmit signal received from the local oscillator.
57 Citations
26 Claims
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1. A radar apparatus comprising:
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a slave radar chip; a master radar chip coupled to the slave radar chip, the master radar chip comprising; a local oscillator configured to generate a transmit signal, wherein the slave radar chip is configured to receive the transmit signal on a first path and configured to send the transmit signal back to the master radar chip on a second path; and a delay detect circuit coupled to the local oscillator and configured to receive the transmit signal from the slave radar chip on the second path and the transmit signal from the local oscillator, the delay detect circuit configured to estimate a routing delay from the transmit signal received from the slave radar chip on the second path and from the transmit signal received from the local oscillator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radar apparatus comprising:
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a slave radar chip; a master radar chip coupled to the slave radar chip, the master radar chip comprising a local oscillator configured to generate a transmit signal, wherein the slave radar chip is configured to receive the transmit signal on a first path from the master radar chip; and an external path coupled to the master radar chip and configured to receive the transmit signal from the master radar chip and provide the transmit signal back to the master radar chip. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A radar apparatus comprising:
a plurality of radar chips, each radar chip comprising one or more transceiver units and a local oscillator integrated on the radar chip, wherein at least one radar chip of the plurality of radar chips is configured as master radar chip and at least one radar chip of the plurality of radar chips is configured as slave radar chip, the master radar chip is coupled to the slave radar chip, the master radar chip comprising; a local oscillator configured to generate a transmit signal, wherein the slave radar chip is configured to receive the transmit signal on a first path and configured to send the transmit signal back to the master radar chip on a second path; and a delay detect circuit coupled to the local oscillator and configured to receive the transmit signal from the slave radar chip on the second path and the transmit signal from the local oscillator, the delay detect circuit configured to estimate a routing delay from the transmit signal received from the slave radar chip on the second path and from the transmit signal received from the local oscillator. - View Dependent Claims (22)
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23. A radar apparatus comprising a master radar chip, the master radar chip comprising:
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a local oscillator configured to generate a transmit signal; a plurality of transmit units coupled to the local oscillator and configured to receive the transmit signal from the local oscillator, a multiplexer coupled to the local oscillator and configured to receive the transmit signal from the local oscillator and configured to send the transmit signal on the external path and receive the transmit signal from the external path; and a plurality of receive units coupled to the multiplexer, wherein the multiplexer is configured to provide the transmit signal received from the external path to the plurality of receive units. - View Dependent Claims (24, 25, 26)
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Specification