CMOS-based receiver for communications applications
View Patent ↗A receiver and receiver front end having multiple independent differential inputs, multiple independent differential low-noise amplifiers, and two sets of double-balanced IQ mixers. The double-balanced mixers include cross-coupled PMOS devices that dynamically inject current at zero-crossing points to cancel out tail currents in the mixers. Also, methods of operating the above-discussed receiver and receiver front end.
1. A receiver, comprising:
a switch capacitor operably connected between an amplifier and a first mixer to optimize a gain transfer to the first mixer,
wherein the first mixer is configured to alter a frequency of a received first signal, received from a first signal input,
wherein the first mixer is operably connected to the first signal input, and
wherein the first mixer includes a noise-reduction device configured to counter-act flicker currents generated within the first mixer while the first mixer is in operation.
2. The receiver of claim 1 , further comprising:
a second signal input that is configured to support a second signal, wherein the second signal input is operably connected to the first mixer.
3. The receiver of claim 2 , wherein the second signal input supports a second signal having a second frequency different from the first frequency.
4. The receiver of claim 1 , wherein the noise-reduction device comprises a cross-coupled switch.
5. The receiver of claim 1 , wherein the noise-reduction device comprises a positive metal oxide semiconductor (PMOS) device.
6. The receiver of claim 5 , wherein the noise-reduction device comprises a cross-coupled positive metal oxide semiconductor (PMOS) device.
7. The receiver of claim 1 , wherein the first mixer comprises an IQ-mixer.
8. The receiver of claim 1 , further comprising a second mixer that is operably connected to the first mixer.
9. The receiver of claim 8 , further comprising a second signal input and a third signal input, each of which is operably connected to the second mixer.
10. A receiver, comprising:
switch capacitor means for optimizing a gain transfer to a mixing means for changing a frequency of an oscillating input signal, wherein the switch capacitor means is operably connected between amplifying means and the mixing means; and
compensating means, within the mixing means, for compensating for a tail current that arises in the mixing means.
11. The receiver of claim 10 , wherein the compensating means comprise a cross-coupled device.
12. The receiver of claim 11 , wherein the compensating means comprise a cross-coupled positive metal oxide semiconductor (PMOS)-based device.
13. A method of manufacturing a receiver, comprising:
connecting a switch capacitor operably between an amplifier and a first mixer to optimize a gain transfer to the first mixer,
configuring the first mixer to alter a frequency of a received first signal, received from a first signal input,
operably connecting the first mixer to the first signal input, and
wherein the first mixer includes a noise-reduction device configured to counter-act flicker currents generated within the first mixer while the first mixer is in operation.