Ultra wide band, differential input/output, high frequency active mixer in an integrated circuit
View Patent ↗A wideband mixer includes a core mixer having input terminals and output terminals for, respectively, receiving differential input signals and providing amplified differential output signals. A steering module is coupled to the core mixer for receiving differential reference signals and providing bi-phase modulated amplified differential output signals. The core mixer is configured to provide a value of gain between the differential input signals and the differential output signals. A bandwidth peaking network is coupled to the core mixer and includes (a) a first coil and a first resistor connected in series and (b) a second coil and a second resistor connected in series. The first coil and resistor and the second coil and resistor, respectively, are coupled to the core mixer for receiving the amplified differential output signals. The bandwidth peaking network is configured to increase the frequency bandwidth of the core mixer.
1. A wideband mixer comprising
a core mixer having input terminals and output terminals for, respectively, receiving differential input signals and providing differential output signals,
a steering module, coupled to the core mixer, for receiving differential reference signals as a first reference signal and a second reference signal,
the core mixer configured to provide bi-phase modulated differential output signals in response to the first and second reference signals,
a bandwidth peaking network including (a) a first coil and a first resistor connected in series and (b) a second coil and a second resistor connected in series,
the first coil and resistor and the second coil and resistor, respectively, coupled to the core mixer for receiving differential core signals and outputting the differential output signals, and
the bandwidth peaking network configured to increase the frequency bandwidth of the core mixer.
2. The wideband mixer of claim 1 , wherein
the core mixer is configured to provide a value of gain between the differential input signals and the differential output signals.
3. The wideband mixer of claim 2 , wherein
the core mixer is configured to provide a value of gain that is adjustable.
4. The wideband mixer of claim 1 including
a common mode bias network coupled between the output terminals for providing a voltage bias control feedback signal across the input terminals, and
the voltage bias control feedback signal providing a virtual ground common mode potential.
5. The wideband mixer of claim 4 , wherein
the common mode potential across the input terminals is substantially equal to a DC potential across the output terminals.
6. A wideband mixer comprising
a core mixer having input terminals and output terminals for, respectively, receiving differential input signals and providing differential output signals,
a steering module, coupled to the core mixer, for receiving differential reference signals as a first reference signal and a second reference signal,
a bandwidth peaking network including (a) a first coil and a first resistor connected in series and (b) a second coil and a second resistor connected in series, and
the first coil and resistor and the second coil and resistor, respectively, coupled to the core mixer for receiving differential core signals and outputting the differential output signals,
wherein the bandwidth peaking network is configured to increase the frequency bandwidth of the core mixer, and
the core mixer is configured to provide bi-phase modulated differential output signals in response to the first and second reference signals.
7. The wideband mixer of claim 6 wherein
the core mixer includes a first amplifier and a second amplifier for receiving the differential input signals,
the steering module includes a first set of steering transistors and a second set of steering transistors, each set of steering transistors receiving both the first and second reference signals,
the first amplifier is coupled to the first set of steering transistors and the second amplifier is coupled to the second set of steering transistors,
the first amplifier and the second amplifier amplify the received differential input signals to provide the differential core signals,
the first set of steering transistors sequentially steers one of the differential core signals to one or the other of the output terminals as the bi-phase modulated differential output signals, and
the second set of steering transistors sequentially steers another of the differential core signals to one or the other of the output terminals as the bi-phase modulated differential output signals.
8. The wideband amplifier of claim 7 wherein
the first set of steering transistors are configured to turn ON or OFF in response to the first and second reference signals, and
the second set of steering transistors are configured to turn ON or OFF in response to the first and second reference signals.
9. The wideband mixer of claim 8 wherein
each of the sets of steering transistors includes a plurality of switching transistors, and
when one of the plurality of switching transistors is turned ON, another of the plurality of switching transistors is turned OFF.
10. The wideband mixer of claim 7 wherein
the bandwidth peaking network includes (a) a first node formed between the first coil and resistor and (b) a second node formed between the second coil and resistor,
a third resistor is connected between the first node and the second node, and
the third resistor is free-of current flow at low frequency operation of the core mixer.
11. The wideband mixer of claim 10 wherein
the bandwidth peaking network is configured to provide a substantially constant gain across the frequency bandwidth of the amplifier.
12. The wideband mixer of claim 10 wherein
the first amplifier is coupled to an end of the first resistor, and the second amplifier is coupled to an end of the second resistor.
13. The wideband mixer of claim 7 including
a common mode bias network coupled between the output terminals for providing a voltage bias control feedback signal across the input terminals, and
the voltage bias control feedback signal providing a virtual ground common mode potential.
14. The wideband mixer of claim 13 wherein
the common mode potential across the input terminals is substantially equal to a DC potential across the output terminals.
15. The wideband mixer of claim 7 wherein
the first amplifier and the second amplifier are configured as physically similar to each other on a die, and
the first set of steering transistors and the second set of steering transistors are configured as physically similar to each other on the die.
16. The wideband mixer of claim 15 wherein
the first amplifier and the second amplifier are formed in a common centroid configuration on the die, and
the first set of steering transistors and the second set of steering transistors are formed in another common centroid configuration on the die.
17. A wideband mixer comprising
a core mixer having input terminals and output terminals for, respectively, receiving differential input signals and providing differential output signals,
the core mixer including a first amplifier and a second amplifier for receiving the differential input signals,
a steering module, coupled to the core mixer, for receiving differential reference signals as a first reference signal and a second reference signal,
the steering module including a first set of steering transistors and a second set of steering transistors, each set of steering transistors receiving both the first and second reference signals,
the first amplifier coupled to the first set of steering transistors and the second amplifier coupled to the second set of steering transistors,
a bandwidth peaking network including (a) a first coil and a first resistor connected in series and (b) a second coil and a second resistor connected in series, and
the first coil and resistor and the second coil and resistor, respectively, coupled to the first and second amplifiers, by way of the respective first and second sets of steering transistors,
wherein the first set of steering transistors sequentially steers an amplified output signal from the first amplifier to one or the other of the output terminals as a bi-phase modulated differential output signal, and
the second set of steering transistors sequentially steers another amplified output signal from the second amplifier to one or the other of the output terminals as another bi-phase modulated differential output signal.
18. The wideband mixer of claim 17 wherein
the first and second amplifiers are biased by a common voltage reference point.
19. The wideband mixer of claim 18 wherein
the common voltage reference point includes an adjustable voltage level for controlling amplification levels of the first and second amplifiers.