COMPACT AND LOW-POWER MILLIMETER-WAVE INTEGRATED VCO-UP/DOWN-CONVERTER WITH GAIN-BOOSTING

• US 20140120848A1
• Filed: 10/29/2013
• Published: 05/01/2014
• Est. Priority Date: 10/30/2012
• Status: Active Grant

• Current Assignee: Maja Systems, Inc
• Original Assignee: Anayas360.Com, LLC
• Inventors: Laskar, Joy
• Granted Patent: US 9,698,852 B2
• Time in Patent Office: Days
• US Class Current: 455/76
• CPC Class Codes: G06F 13/4068 Electrical coupling
• CPC Class Codes: G06F 13/42 Bus transfer protocol, e.g. handshake; Synchronisation
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 1/403 using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A wireless data transceiver comprises a local oscillator configured to generate a first time-varying signal of a first frequency at an output of the local oscillator. The transceiver further comprises a local oscillator interface circuit coupled to the local oscillator. The local oscillator interface circuit is configured to generate a second time-varying signal of the first frequency with negative conductance at an output of the local oscillator interface circuit. The negative conductance is generated based on capacitive degeneration. The transceiver further comprises a frequency mixer coupled to the output of the local oscillator interface circuit. The frequency mixer is configured to generate a third time-varying signal of a second frequency based on the second time-varying signal.

Claims

1. A wireless data transceiver, comprising:

a local oscillator configured to generate a first time-varying signal of a first frequency at an output of the local oscillator;

a local oscillator interface circuit coupled to the local oscillator, wherein the local oscillator interface circuit is configured to generate a second time-varying signal of the first frequency with negative conductance at an output of the local oscillator interface circuit, wherein the negative conductance is generated based on capacitive degeneration; and

a frequency mixer coupled to the output of the local oscillator interface circuit, wherein the frequency mixer is configured to generate a third time-varying signal of a second frequency based on the second time-varying signal.

2. The wireless data transceiver of claim 1, wherein the local oscillator interface circuit comprises a differential common-source amplifier.

3. The wireless data transceiver of claim 2, wherein the local oscillator interface circuit comprises a first transistor and a second transistor, and wherein a gate of the first transistor receives a positive version of the first time-varying signal and a gate of the second transistor receives a negative version of the first time-varying signal.

4. The wireless data transceiver of claim 3, wherein a positive version of the output of the local oscillator interface circuit is coupled to a drain of the first transistor and a negative version of the output of the local oscillator interface circuit is coupled to a drain of the second transistor.

5. The wireless data transceiver of claim 3, wherein the local oscillator interface circuit further comprises a third transistor and a fourth transistor, wherein a source of the first transistor is coupled to a drain of the third transistor, and wherein a source of the second transistor is coupled to a drain of the fourth transistor.

6. The wireless data transceiver of claim 5, wherein the third transistor and the fourth transistor are configured to operate in a linear region.

7. The wireless data transceiver of claim 6, wherein a bias of a gate of the third transistor and a bias of a gate of the fourth transistor is programmable by a controller.

8. The wireless data transceiver of claim 1, wherein the frequency mixer is a Gilbert-cell mixer.

9. A wireless data transceiver, comprising:

a local oscillator configured to generate a first time-varying signal of a first frequency at an output of the local oscillator; and

a frequency mixer coupled to the output of the local oscillator, wherein the frequency mixer is configured to generate negative conductance, and wherein the frequency mixer is further configured to generate a second time-varying signal of a second frequency based on the first time-varying signal.

10. The wireless data transceiver of claim 9, wherein the frequency mixer is further configured to generate negative conductance using capacitive degeneration.

11. The wireless data transceiver of claim 10, wherein the frequency mixer comprises a double-balanced Gilbert-cell mixer.

12. The wireless data transceiver of claim 11, wherein the frequency mixer comprises a first baseband/intermediate frequency (BB/IF) transistor, a second BB/IF transistor, and a resistor-capacitor network coupled between the first BB/IF transistor and the second BB/IF transistor.

13. The wireless data transceiver of claim 12, wherein the resistor-capacitor network comprises a resistor in parallel with a capacitor.

14. The wireless data transceiver of claim 12, wherein the resistor-capacitor network comprises a third transistor.

15. The wireless data transceiver of claim 12, wherein the resistor-capacitor network is coupled between a drain of the first BB/IF transistor and a drain of the second BB/IF transistor.

16. The wireless data transceiver of claim 15, wherein the frequency mixer comprises a third transistor and a fourth transistor, wherein a gate of the third transistor is coupled to a positive version of the output of the local oscillator, and wherein a gate of the fourth transistor is coupled to a negative version of the output of the local oscillator.

17. The wireless data transceiver of claim 16, wherein the resistor-capacitor network is coupled between a source of the third transistor and a source of the fourth transistor.

18. The wireless data transceiver of claim 17, wherein a positive version of the second time-varying signal is generated at a drain of the third transistor, and wherein a negative version of the second time-varying signal is generated at a drain of the fourth transistor.

19. A method for reducing power consumption in a wireless data transceiver, the method comprising:

receiving a first time-varying signal of a first frequency from an output of a local oscillator;

generating negative conductance;

generating a second time-varying signal of the first frequency using the negative conductance; and

transmitting the second time-varying signal to a frequency mixer, wherein the frequency mixer generates a third time-varying signal of a second frequency based on the second time-varying signal.

20. The method of claim 19, wherein generating negative conductance comprises generating negative conductance based on capacitive degeneration.

21. The method of claim 20, wherein generating negative conductance based on capacitive degeneration comprises generating the negative conductance using at least one transistor that operates in a linear region.

22. The method of claim 21, wherein generating a second time-varying signal comprises generating the second time-varying signal using a second transistor coupled in series with the at least one transistor, and wherein a source of the at least one transistor is coupled to ground.

23. The method of claim 21, wherein a bias of a gate of the at least one transistor is programmable by a controller.

24. The method of claim 20, wherein the frequency mixer is a Gilbert-cell mixer.