Current-mode signal path of an integrated radio frequency pulse generator
One or more systems, devices and/or methods of use provided herein relate to a device that can support a signal generation. A current-mode end-to-end signal path can include a digital to analog converter (DAC) operating in current-mode and an upconverting mixer, operating in current-mode and operatively coupled to the DAC. Analog inputs and outputs of the DAC and upconverting mixer can be represented as currents, and the DAC can generate a baseband signal. The DAC and upconverting mixer each can comprise switching transistors of the same type, such as p-type metal-oxide semiconductor (PMOS) switching transistors. In one or more embodiments, a current source and a diode-connected transistor can be arranged in parallel in the current-mode signal path, and the current source passes a static current, while the diode-connected transistor passes both a static current and a dynamic current.
1. A device, comprising:
a digital to analog converter, a baseband filter and an output stage defining a current-mode signal path,
wherein the current-mode signal path enables a lower static-to-dynamic current ratio at the output stage than at the baseband filter, and
wherein the digital to analog converter and the output stage each comprise switching transistors of a same type; and
a current subtractor implemented as a parallel combination of a current source and a diode-connected transistor arranged in the current-mode signal path.
2. The device of claim 1 , wherein the same type of the switching transistors is p-type metal-oxide semiconductor (PMOS) transistors.
3. The device of claim 1 , wherein the output stage comprises an upconverting mixer that generates a radio frequency output signal, and wherein the upconverting mixer has two or more switching transistors being the same type of switching transistors as the switching transistors of the digital to analog converter.
4. The device of claim 1 , wherein the switching transistors of the digital to analog converter and of the output stage are operatable with rail-to-rail waveforms.
5. The device of claim 4 , wherein the switching transistors of the digital to analog converter and of the output stage operate from a reduced supply voltage as compared to use of switching transistors of a n-type metal-oxide semiconductor (NMOS) type.
6. The device of claim 1 , wherein the diode-connected transistor is directly connected to the output stage absent a turnaround current mirror connected between the diode-connected transistor and the output stage.
7. The device of claim 1 , wherein the current source passes a static current and the diode-connected transistor passes both the static current and a dynamic current.
8. The device of claim 1 , wherein the current source is programmable to tune a static-to-dynamic current ratio at the diode-connected transistor and at the output stage.
9. A method, comprising:
outputting a radio frequency output signal by a radio frequency (RF) pulse generator operatively coupled to a quantum processor, wherein the RF pulse generator comprises:
a digital to analog converter, a baseband filter and an output stage defining a current-mode signal path, and current source and a diode-connected transistor arranged in parallel in the current-mode signal path,
wherein the digital to analog converter and the output stage each comprise switching transistors of a same type; and
varying, by the RF pulse generator, a static-to-dynamic current ratio at the diode-connected transistor.
10. The method of claim 9 , wherein the same type of the switching transistors is p-type metal-oxide semiconductor (PMOS) transistors, and wherein an upconverting mixer of the output stage comprises two or more of the switching transistors of the output stage.
11. The method of claim 9 , further comprising:
generating, by the RF pulse generator, a radio frequency output at an upconverting mixer of the output stage.
12. The method of claim 9 , further comprising:
operating, by the RF pulse generator, the switching transistors of the digital to analog converter and of the output stage with rail-to-rail waveforms.
13. The method of claim 12 , further comprising:
operating the switching transistors of the digital to analog converter and of the output stage from a reduced supply voltage as compared to use of switching transistors of an n-type metal-oxide semiconductor (NMOS) type.
14. The method of claim 9 , further comprising:
outputting, by the RF pulse generator, a lower static-to-dynamic current ratio at the output stage than at the baseband filter.
15. The method of claim 9 , further comprising:
producing, by the RF pulse generator, an output signal referenced to ground from the output stage.
16. The method of claim 9 , directly coupling the diode-connected transistor to the output stage absent a turnaround current mirror connected between the diode-connected transistor and the output stage.
17. A system, comprising:
a quantum controller; and
a radio frequency (RF) pulse generator controlled by the quantum controller, wherein the RF pulse generator comprises:
a digital to analog converter, a baseband filter and an output stage defining a current-mode signal path,
wherein the output stage comprises an upconverting mixer that generates a radio frequency output signal, and
wherein the digital to analog converter and the upconverting mixer each comprise p-type metal-oxide semiconductor (PMOS) switching transistors; and
a current source and a diode-connected transistor arranged in parallel in the current-mode signal path, wherein the current source passes a static current and the diode-connected transistor passes both a static current and a dynamic current.
18. The system of claim 17 , wherein the output stage generates the radio frequency output signal referenced to ground.
19. The system of claim 17 , wherein the current source is programmable to tune a static-to-dynamic current ratio at the diode-connected transistor and at the output stage.
20. The system of claim 17 , wherein the diode-connected transistor is directly connected to the output stage absent a turnaround current mirror connected between the diode-connected transistor and the output stage.