Device and method for transmitting a radar signal

1. A radar transmitting device, comprising:

a Complementary Metal-Oxide Semiconductor (CMOS) transceiver chip configured to provide at least one local oscillator signal at an output of the CMOS transceiver chip,

wherein the CMOS transceiver chip includes transmission functionality and reception functionality; and

a Bipolar Complementary Metal-Oxide Semiconductor (BiCMOS) transmitter chip coupled to the CMOS transceiver chip,

wherein the BiCMOS transmitter chip does not include functionalities to receive one or more reflected radar signals,

wherein the CMOS transceiver chip is configured to generate a local oscillator signal, of the at least one local oscillator signal, for the BiCMOS transmitter chip, and

wherein the BiCMOS transmitter chip includes:

an input for the local oscillator signal,

at least one amplifier coupled to the input,

a plurality of outputs for outputting a radar transmission signal based on the local oscillator signal, and

a plurality of transmission paths between the input and the plurality of outputs,

wherein each of the transmission paths has a controllable analog phase shifter for controllable beam scanning during emission of the radar transmission signal.

2. The radar transmitting device as claimed in claim 1 , wherein the CMOS transceiver chip includes a phase control unit configured to generate phase control signals for controlling the controllable analog phase shifter for controllable beam scanning.

3. The radar transmitting device as claimed in claim 1 , wherein the CMOS transceiver chip is configured to selectively activate or deactivate individual transmission paths of the BiCMOS transmitter chip using control signals.

4. The radar transmitting device as claimed in claim 1 , wherein the CMOS transceiver chip is configured for digital beamforming for combination with the beam scanning by the BiCMOS transmitter chip.

5. The radar transmitting device as claimed in claim 4 , wherein the CMOS transceiver chip has a plurality of reception channels, wherein phases of the plurality of reception channels are set during digital beamforming in such a way that a main reception direction is based on information of a set beam during beam scanning.

6. The radar transmitting device as claimed in claim 1 , wherein the CMOS transceiver chip is configured for phase encoding of different radar transmission signals assigned to different transmission paths.

7. The radar transmitting device as claimed in claim 1 , wherein the CMOS transceiver chip is configured to provide, at an output of the CMOS transceiver chip, at least one FMCW radar signal for the BiCMOS transmitter chip.

8. The radar transmitting device as claimed in claim 1 , wherein the BiCMOS transmitter chip includes a first BiCMOS transmitter chip coupled to the CMOS transceiver chip and a second BiCMOS transmitter chip coupled to the CMOS transceiver chip.

9. The radar transmitting device as claimed in claim 8 , wherein the first BiCMOS transmitter chip is coupled to a first antenna array for beam scanning in an elevation direction and the second BiCMOS transmitter chip is coupled to a second antenna array for beam scanning in an azimuth direction.

10. The radar transmitting device as claimed in claim 8 , wherein the first BiCMOS transmitter chip is coupled to a first antenna array for beam scanning in an azimuth direction and the second BiCMOS transmitter chip is coupled to a second antenna array for beam scanning in an azimuth direction, or wherein the first BiCMOS transmitter chip is coupled to a first antenna array for beam scanning in an elevation direction and the second BiCMOS transmitter chip is coupled to a second antenna array for beam scanning in an elevation direction.

11. The radar transmitting device as claimed in claim 1 , wherein the CMOS transceiver chip has one or more inputs for one or more reception signals, the one or more inputs being able to be coupled to receiving antennas.

12. The radar transmitting device as claimed in claim 1 , wherein the amplifier of the BiCMOS transmitter chip is embodied using bipolar technology.

13. The radar transmitting device as claimed in claim 1 , wherein the controllable analog phase shifter of the BiCMOS transmitter chip are embodied using bipolar technology.

14. The radar transmitting device of claim 1 , wherein the transmission functionality of the CMOS transceiver chip does not provide one or more transmission signals to one or more transmission antennas.

15. A motor vehicle, comprising:

a radar transmitting device comprising:

a Complementary Metal-Oxide Semiconductor (CMOS) transceiver chip configured to provide at least one local oscillator signal at an output of the CMOS transceiver chip,

wherein the CMOS transceiver chip includes transmission functionality and reception functionality; and

a Bipolar Complementary Metal-Oxide Semiconductor (BiCMOS) transmitter chip coupled to the CMOS transceiver chip,

wherein the BiCMOS transmitter chip does not include functionalities to receive one or more reflected radar signals,

wherein the CMOS transceiver chip is configured to generate a local oscillator signal, of the at least one local oscillator signal, for the BiCMOS transmitter chip, and

wherein the BiCMOS transmitter chip includes:

an input for the local oscillator signal,

at least one amplifier coupled to the input,

a plurality of outputs for outputting a radar transmission signal based on the local oscillator signal, and

a plurality of transmission paths between the input and the plurality of outputs,

 wherein each of the transmission paths has a controllable analog phase shifter for controllable beam scanning during emission of the radar transmission signal.

16. A method for transmitting a radar signal, comprising:

providing a local oscillator signal using a Complementary Metal-Oxide Semiconductor (CMOS) transceiver chip,

wherein the CMOS transceiver chip includes transmission functionality and reception functionality; and

further processing of the local oscillator signal using a Bipolar Complementary Metal-Oxide Semiconductor (BiCMOS) transmitter chip,

wherein the BiCMOS transmitter chip does not include functionalities to receive one or more reflected radar signals, and

wherein the further processing on the BiCMOS transmitter chip includes:

amplifying the local oscillator signal or a radar signal derived therefrom,

distributing the local oscillator signal or the radar signal derived therefrom among a plurality of transmission paths of the BiCMOS transmitter chip,

wherein each of the transmission paths has a controllable analog phase shifter for controllable beam scanning during emission of the radar signal, and

controlling the controllable analog phase shifter using control signals.

17. A radar transmitting device, comprising:

a Complementary Metal-Oxide Semiconductor (CMOS) transceiver chip configured to provide at least one local oscillator signal at an output of the CMOS transceiver chip,

wherein the CMOS transceiver chip includes transmission functionality and reception functionality; and

a Bipolar Complementary Metal-Oxide Semiconductor (BiCMOS) transmitter chip coupled to the CMOS transceiver chip,

wherein the BiCMOS transmitter chip does not include functionalities to receive one or more reflected radar signals,

wherein the CMOS transceiver chip is configured to generate a local oscillator signal, of the at least one local oscillator signal, for the BiCMOS transmitter chip, and

wherein the BiCMOS transmitter chip includes:

an input for the local oscillator signal,

at least one amplifier coupled to the input,

a plurality of outputs for outputting a radar transmission signal based on the local oscillator signal, and

a plurality of transmission paths between the input and the plurality of outputs, and

wherein the CMOS transceiver chip is configured to selectively activate or deactivate individual transmission paths of the BiCMOS transmitter chip using control signals.

18. The radar transmitting device as claimed in claim 17 , wherein the CMOS transceiver chip is configured for phase encoding of different radar transmission signals assigned to different transmission paths.

19. The radar transmitting device as claimed in claim 17 , wherein each of the transmission paths has a controllable analog phase shifter for controllable beam scanning during emission of the radar transmission signal.

20. A method for transmitting a radar signal, comprising:

providing a local oscillator signal using a Complementary Metal-Oxide Semiconductor (CMOS) transceiver chip,

wherein the CMOS transceiver chip includes transmission functionality and reception functionality;

further processing of the local oscillator signal using a Bipolar Complementary Metal-Oxide Semiconductor (BiCMOS) transmitter chip,

wherein the BiCMOS transmitter chip does not include functionalities to receive one or more reflected radar signals,

wherein the further processing on the BiCMOS transmitter chip comprises:

amplifying the local oscillator signal or a radar signal derived therefrom;

distributing the local oscillator signal or the radar signal derived therefrom among a plurality of transmission paths of the BiCMOS transmitter chip,

wherein each of the transmission paths is selectively activatable or deactivatable; and

activating or deactivating individual transmission paths using control signals.