Single RF oscillator technique for built-in tune, test, and calibration of a transceiver

1. A method for loopback tuning, testing, and calibrating (TTC) of a transceiver, comprising:

supplying RF drive to both a transmitter and a receiver of the transceiver from one oscillator;

applying a modulation waveform to a transceiver block of the transceiver to produce an amplitude-modulated signal;

converting a sideband of the amplitude-modulated signal to a baseband signal having a frequency suitable for processing by a receiver digital block, where processing the baseband signal produces a digital output; and

performing at least one of tuning, testing, and calibrating of the transceiver block, based at least in part on the digital output.

2. The method of claim 1 , further comprising:

prior to supplying RF drive:

a TTC controller setting the transceiver into a TTC mode; and

prior to applying the modulation waveform:

the TTC controller controlling a controller to supply the modulation waveform.

3. The method of claim 2 , where setting the transceiver into the TTC mode comprises:

placing an antenna switch of the transceiver in loopback mode by coupling a signal at a transmitter (TX) port of the antenna switch to a receiver (RX) port of the antenna switch; and

controlling the one oscillator to drive both a receiver mixer and a transmit buffer of the transceiver; and

where the TTC controller controlling a controller to supply a modulation waveform comprises:

controlling an On-Off Key (OOK) control block to supply the modulation waveform to the transmit buffer to produce a modulation sideband at a desired center frequency of a transmit filter.

4. The method of claim 2 , further comprising:

the TTC controller adjusting a center frequency of a transmit filter to produce an adjusted baseband signal; and

re-evaluating the adjusted baseband signal.

5. The method of claim 1 , where applying the modulation waveform to a transceiver block comprises applying the modulation waveform to an enable input of the transceiver block.

6. The method of claim 1 , where the modulation waveform is a series of pulses.

7. The method of claim 1 , where the modulation waveform is a substantially square wave.

8. The method of claim 1 , where the modulation waveform is a substantially sinusoidal wave.

9. The method of claim 1 , where performing the at least one of tuning, testing, and calibrating comprises adjusting a center frequency of a filter.

10. The method of claim 1 , where performing the at least one of tuning, testing, and calibrating comprises adjusting a bandwidth of a filter.

11. The method of claim 1 , where the at least one of tuning, testing, and calibrating comprises adjusting a gain of the transceiver block.

12. The method of claim 11 , where the adjusting the gain of the transceiver block comprises adjusting at least one of a voltage, current, resistance, capacitance, and inductance of the transceiver block.

13. The method of claim 11 , where adjusting the gain of the transceiver block is performed for a target output level.

14. The method of claim 1 , where the at least one of tuning, testing, and calibrating comprises adjusting a capacitor value for a maximum output level of the transceiver block.

15. The method of claim 1 , where the at least one of tuning, testing, and calibrating comprises determining that gain values of a switchable-gain block differ by predetermined amounts.

16. The method of claim 1 , where the at least one of tuning, testing, and calibrating comprises determining that the transceiver meets predetermined specifications.

17. The method of claim 1 , where the at least one of tuning, testing, and calibrating comprises identifying a fault in at least one of design and manufacture of the transceiver.

18. The method of claim 1 , where the one oscillator is a voltage controlled oscillator.

19. The method of claim 1 , where the transmitter of the transceiver is frequency modulated.