Abstract:
A voltage gain amplifier (VGA) configured to have reduced supply noise. The VGA includes first resistor, first FET, and a first current-source coupled between first and second voltage rails. The VGA includes second resistor, second FET, and second current-source coupled between the voltage rails. A variable resistor is coupled between the respective sources of the first and second FETs. Variable capacitors are coupled between the first or a third voltage rail and the sources of the first and second input FETs, respectively. If capacitors are coupled to the first voltage rail, noise cancellation occurs across the gate-to-source voltages of the FETs if an input differential signal applied to the gates of the FETs is derived from a supply voltage at the first voltage rail. If capacitors are coupled to the third rail, supply noise is reduced if the supply voltage at the third rail is generated by a cleaner regulator.
Abstract:
A common mode logic buffer device includes a current source (112) configured to provide a source current. An input stage includes a first MOS transistor pair (110) configured to generate, from the source current and based upon an input differential voltage, a differential current between two output paths. An output stage includes a second MOS transistor pair (106) configured to generate an output differential voltage based upon an effective impedance provided for the each of the two output paths. An adjustment circuit (104, 108) is configured to adjust, in response to a control signal, the effective impedance of the second MOS transistor pair (106).
Abstract:
A circuit (200) may include an input terminal (202, 203) configured to receive an input signal with a first voltage swing and an output terminal (204, 205). The circuit may also include a first transistor (220), a second transistor (221), a third transistor (222), and a control circuit (210). The control circuit may be coupled to the input terminal (202, 203), a gate terminal of the first transistor (220), and a gate terminal of the second transistor (221). The control circuit may be configured to adjust voltages provided to the gate terminals based on the input signal (202, 203) such that the first transistor (220) conducts in response to the input signal being at a first logical level and the second transistor (221) conducts in response to the input signal being at a second logical level to generate an output signal (204, 205) output on the output terminal (204, 205). The second voltage swing of the output signal (204-205) may be different from the first voltage swing of the input signal (202-203).
Abstract:
Described herein is a high-voltage level-shifter (HVLS) that can be used for both NMOS and PMOS bridges, exhibits a higher voltage tolerance for over-clocking than traditional level-shifters, has reduced crowbar current in its input driver, and no contention in its output driver. The HVLS comprises an input driver including a first signal conditioning unit, the input driver operating on a first power supply level and for conditioning an input signal as a first signal in the first signal conditioning unit; and a circuit to receive the first signal and to provide a second signal based at least in part on the first signal, the second signal being level-shifted from the first power supply level to a second power supply level, wherein the second power supply level is higher than the first power supply level.
Abstract:
Ein Schaltungssystem weist eine Einrichtung (102) zum Ansteuern einer ersten und einer zweiten Speichereinheit mittels eines differentiellen Ansteuersignals auf. Das differentielle Ansteuerungssignal weist ein erstes Ansteuersignal und ein zweites, zu dem ersten Ansteuersignal invertiertes, Ansteuerungssignal auf. Ferner weist das Schaltungssystem eine differentielle Ansteuersignalleitung 120, die eine erste Signalleitung (122) zum Führen des ersten Ansteuersignals und eine zweite Signalleitung (124) zum Führen des zweiten Ansteuersignals aufweist auf. Die erste Schalteinheit (104) ist über die erste Signalleitung (122) und die zweite Schaltungseinheit (106) ist über die zweite Signalleitung (124) mit der Einrichtung (102) zum Ansteuern verbunden.
Abstract:
A differential output buffer (40) formed on a monolithic semiconductor substrate characterized by a bias generator (42) coupled to a voltage source (Vdd) and an output stage (44) coupled to the bias generator. The bias generator develops a bias output (80A, 80B) having a voltage level less than that of the voltage source. The output stage is responsive to a pair of complementary CMOS logic level inputs (D, D*) and uses the bias output of the bias generator to develop a pair of corresponding, low voltage swing outputs (Q, Q*). In one embodiment the bias generator and the output stage operate in an open-loop and produce output signals which swing approximately two volts and in another embodiment the bias generator and the output stage operate in a closed-loop configuration and produce output signals which swing approximately one volt.
Abstract:
A voltage gain amplifier (VGA) configured to have reduced supply noise. The VGA includes first resistor, first FET, and a first current-source coupled between first and second voltage rails. The VGA includes second resistor, second FET, and second current-source coupled between the voltage rails. A variable resistor is coupled between the respective sources of the first and second FETs. Variable capacitors are coupled between the first or a third voltage rail and the sources of the first and second input FETs, respectively. If capacitors are coupled to the first voltage rail, noise cancellation occurs across the gate-to-source voltages of the FETs if an input differential signal applied to the gates of the FETs is derived from a supply voltage at the first voltage rail. If capacitors are coupled to the third rail, supply noise is reduced if the supply voltage at the third rail is generated by a cleaner regulator.
Abstract:
In one example, a driver circuit includes a differential transistor pair (504) configured to be biased by a current source (502) and including a differential input (516) and a differential output (512). The driver circuit further includes a resistor pair (506) coupled between a node pair and the differential output, a transistor pair coupled between a voltage supply and the node pair, and a bridge transistor coupled between the node pair. The driver circuit further includes a pair of three-state circuit elements (510) having a respective pair of input ports, a respective pair of control ports, and a respective pair of output ports. The pair of output ports is respectively coupled to the node pair. The pair of control ports is coupled to a common node comprising each gate of the transistor pair and a gate of the bridge transistor.