摘要:
A power supply controller controls the power supply voltage provided to a multi-gain step RF power amplifier to increase the efficiency of the RF power amplifier when the different gains of the RF power amplifier are selected and, thereby, reduce the power consumed by the multi-gain step RF power amplifier.
摘要:
A system and a method are disclosed for controlling overshoot and undershoot in a switching regulator circuit. A first comparator circuit for controlling an undershoot of an output voltage of the switching regulator circuit is provided that that detects an occurrence of an undershoot of the output voltage of the switching regulator circuit and activates a first current source to pull up the output voltage of the switching regulator circuit. A second comparator circuit for controlling an overshoot of an output voltage of the switching regulator circuit is provided that detects an occurrence of an overshoot of the output voltage of the switching regulator circuit and activates a second current source to pull down the output voltage of the switching regulator circuit.
摘要:
A differential-to-single-ended (DSE) converter receives a positive differential input and a negative differential input and generates a single-ended output. The DSE converter comprises: 1) a first comparator having a non-inverting input coupled to the positive differential input and an inverting input coupled to the negative differential input; 2) a second comparator having an inverting input coupled to the positive differential input and a non-inverting input coupled to the negative differential input; 3) a first D flip-flop having a Logic 1 input and clocked by a rising edge on the first comparator output; 4) a second D flip-flop having a Logic 1 input and clocked by a rising edge on the second comparator output; and 5) a latch circuit having a first input coupled to the first D flip-flop output and a second input coupled to the second D flip-flop output. Rising edges on the first and second D flip-flop outputs cause the latch output to change state.
摘要:
A differential-to-single-ended (DSE) converter receives a positive differential input and a negative differential input and generates a single-ended output. The DSE converter comprises: 1) a first comparator having a non-inverting input coupled to the positive differential input and an inverting input coupled to the negative differential input; 2) a second comparator having an inverting input coupled to the positive differential input and a non-inverting input coupled to the negative differential input; 3) a first D flip-flop having a Logic 1 input and clocked by a rising edge on the first comparator output; 4) a second D flip-flop having a Logic 1 input and clocked by a rising edge on the second comparator output; and 5) a latch circuit having a first input coupled to the first D flip-flop output and a second input coupled to the second D flip-flop output. Rising edges on the first and second D flip-flop outputs cause the latch output to change state.
摘要:
A spare logic circuit for implementing any one of a plurality of logic gates includes a multiplexer circuit whose select inputs are utilized as logic gate inputs, and whose output is utilized as a logic gate output. Each of a plurality of data inputs of the multiplexer circuit is configured to receive one of first and second logic voltage levels which define the desired logic function. By modifying a single photolithographic mask, the spare logic gate can be: configured to perform the desired logic function; connected into a target logic circuit; or both configured and connected into a target logic circuit.
摘要:
A pull-down circuit for pulling a high-impedance node to ground when a pull-down (PD) signal driving the pull-down circuit is Logic 1. The pull-down circuit comprises: 1) a first pull-down N-channel transistor having a drain coupled to the high-impedance node, a gate coupled to the PD signal, and a source coupled to a common node; 2) a second pull-down N-channel transistor having a drain coupled to the common node, a gate coupled to the PD signal, and a source coupled to a ground rail;, wherein the first and second pull-down N-channel transistors are off when the PD signal is Logic 0 and are on when the PD signal is Logic 1; and 3) a gate-biasing circuit driven by the PD signal. The gate-biasing circuit is off when the PD signal is Logic 1 and the gate-biasing circuit applies a Logic 1 bias voltage to the common node when the PD signal is Logic 0. The Logic 1 bias voltage creates a negative Vgs bias on the first pull-down N-channel transistor when the PD signal is Logic 0. An analogous pull-up circuit also is disclosed.
摘要:
The saturation compensating analog to digital converter has converter circuitry receiving an analog signal and outputting converted data. The converted data from the converter circuitry is processed and filtered to provide a digital data output. The digital data output is received into shift register circuitry before being transmitted for later-stage processing. When the converter circuitry is operating close to a saturated condition, a saturation detector generates a saturation signal. The saturation signal is received at a variable gain circuit which adjusts the gain of the input signal to the converter circuitry. The shift register circuitry also receives the saturation signal and provides an upshift of the digital data to compensate for the associated reduction in input gain provided by the variable gain circuit. In operation, the variable gain circuit is initially set to its maximum output, thus providing the maximum possible input signal to the converter. If a near-saturation conditional is detected, the variable gain circuit is stepped down, and the shift register circuitry provides an associated one bit step up. Such saturation compensation is continued to enable the converter circuitry to operate without saturating.
摘要:
A spare logic circuit for implementing any one of a plurality of logic gates includes a multiplexer circuit whose select inputs are utilized as logic gate inputs, and whose output is utilized as a logic gate output. Each of a plurality of data inputs of the multiplexer circuit is configured to receive one of first and second logic voltage levels which define the desired logic function. By modifying a single photolithographic mask, the spare logic gate can be: configured to perform the desired logic function; connected into a target logic circuit; or both configured and connected into a target logic circuit.
摘要:
A spare logic circuit for implementing any one of a plurality of logic gates includes a multiplexer circuit whose select inputs are utilized as logic gate inputs, and whose output is utilized as a logic gate output. Each of a plurality of data inputs of the multiplexer circuit is configured to receive one of first and second logic voltage levels which define the desired logic function. By modifying a single photolithographic mask, the spare logic gate can be: configured to perform the desired logic function; connected into a target logic circuit; or both configured and connected into a target logic circuit.
摘要:
The dynamic range of a charging current in an open-loop LED driver circuit is scaled to provide a charging current within tolerance for the open-loop LED driver. The scaling of the dynamic range of the charging current is performed transparently to the user, such that user selected parameters for the open-loop LED driver remain unchanged during circuit performance.