An apparatus comprises a radio frequency (RF) transceiver circuit; a phase modulator that comprises digital-to-time converter (DTC) circuitry configured to convert a digital value to a specified signal phase of a signal transmitted by the RF transceiver circuit; low drop out regulator (LDO) circuitry operatively coupled to the DTC circuitry, wherein a bias current of the LDO circuitry is adjustable; and logic circuitry operatively coupled to the LDO circuitry and DTC circuitry, wherein the logic circuitry is configured to set the adjustable bias current of the LDO circuitry according to a digital value input to the DTC circuitry.

Provided is a shunt regulator including: multiple resistors, connected in series between an output terminal and a ground terminal and constituting a voltage divider circuit; an output transistor, connected between the output terminal and the ground terminal; a first drive circuit, including a first reference voltage circuit which outputs a first reference voltage and an error amplifier, and controlling the output transistor based on a voltage of a first output terminal of the voltage divider circuit; a second drive circuit, controlling the output transistor based on a voltage of a second output terminal of the voltage divider circuit; and an activation control circuit, switching operation of the first drive circuit and the second drive circuit based on the first reference voltage. The second drive circuit has a shorter activation time than the first drive circuit.

Provided is a shunt regulator including: multiple resistors, connected in series between an output terminal and a ground terminal and constituting a voltage divider circuit; an output transistor, connected between the output terminal and the ground terminal; a first drive circuit, including a first reference voltage circuit which outputs a first reference voltage and an error amplifier, and controlling the output transistor based on a voltage of a first output terminal of the voltage divider circuit; a second drive circuit, controlling the output transistor based on a voltage of a second output terminal of the voltage divider circuit; and an activation control circuit, switching operation of the first drive circuit and the second drive circuit based on the first reference voltage. The second drive circuit has a shorter activation time than the first drive circuit.

New devices and methods for producing a precision current source or sink with programmable slew rate are disclosed. For example, an electronic circuit capable of providing precision current control including a programmable slew rate is disclosed. For example, the electronic circuit can include a constant current circuit configured to provide a constant current, and a transient current circuit coupled to the constant current circuit at a common electrical node, the transient current circuit configured to sample the constant current of the constant current circuit during a sampling phase, then provide a turn-on programmable slew rate based on the sampled constant current during an active phase.

New devices and methods for producing a precision current source or sink with programmable slew rate are disclosed. For example, an electronic circuit capable of providing precision current control including a programmable slew rate is disclosed. For example, the electronic circuit can include a constant current circuit configured to provide a constant current, and a transient current circuit coupled to the constant current circuit at a common electrical node, the transient current circuit configured to sample the constant current of the constant current circuit during a sampling phase, then provide a turn-on programmable slew rate based on the sampled constant current during an active phase.

Methods and apparatus provide compensation for impedance changes in a network energized by an amplifier, such as a class E amplifier. In embodiments, bus voltage amplifier fundamental AC output voltage can be used to generate a feedback signal for adjusting impedance of one or more components in the network. In embodiments, the amplifier fundamental AC output voltage is determined from current to the load, wherein the load is coupled to the amplifier by an LCL impedance matching network.

Methods and apparatus provide compensation for impedance changes in a network energized by an amplifier, such as a class E amplifier. In embodiments, bus voltage amplifier fundamental AC output voltage can be used to generate a feedback signal for adjusting impedance of one or more components in the network. In embodiments, the amplifier fundamental AC output voltage is determined from current to the load, wherein the load is coupled to the amplifier by an LCL impedance matching network.

An apparatus is provided which comprises: a first power gate transistor coupled to an ungated power supply node and a gated power supply node, the first power gate transistor having a gate terminal controllable by a first logic; and a second power gate coupled to the ungated power supply node and the gated power supply node, the second power gate transistor having a gate terminal controllable by a second logic, wherein the first power gate transistor is larger than the second power gate transistor, and wherein the second logic is operable to: weakly turn on the second power gate, fully turn on the second power gate, turn off the second power gate, and connecting the second power gate as diode.

A circuit includes a regulation module having a threshold input to receive a clamp threshold voltage and a feedback input to monitor a swing-limited output voltage. The regulation module generates a difference signal that indicates a difference between the clamp threshold voltage and the swing-limited output voltage. A current compensation module includes a clamp port and an input port. The clamp port to controls the swing-limited output voltage and the input port receives the difference signal. The clamp port generates an adjustment current to control the swing-limited output voltage based on the difference signal. An adjustment network receives an input voltage and the adjustment current from the clamp port. The adjustment current to generate a voltage across the adjustment network such that the swing-limited output voltage at the clamp port is adjusted within a voltage range of the input voltage.

An electronic device may include a main circuit including multiple sub-circuits powered by a direct-current (DC) power supply circuit. The main circuit has a main circuit current demand being a time-varying demand for a DC voltage-regulated supply current being a function of a number of the sub-circuits being active. The DC power supply circuit may include multiple DC voltage regulators to provide the main circuit with the supply current and a command decoding and power management circuit to control enablement of the voltage regulators. The command decoding and power management circuit may be configured to detect an instant value of the main circuit current demand and to selectively enable one or more of the voltage regulators based on the detected instant value.