An encoding modulation method and transmitter are described. The method includes: oversampling and noise-shaping received multi-bit data to obtain N bits of data; using the N bits of data as a lookup table address to obtain a PWM puke modulation signal; multiplexing synthetic orthogonal (IQ) complex data of the PWM pulse modulation signal to be real number signal data; and converting the multiplexed real number signal data to an analog signal for power amplification and output, N being an integer representing a smaller number of bits than the received multi-bit data.

Embodiments are directed to modulating a pulse width modulation (PWM) signal, by initializing at least one phase index to an initial value, establishing a set of values in a lookup table that correspond to data points for PWM comparator values that correspond to a given number of samples of a single periodic waveform during a predetermined sampling rate that establishes a table resolution, repeatedly executing the following operations at the predetermined sampling rate: determining a value of a command signal frequency, setting a value to a jump factor equal to the quotient of the value of the command signal frequency divided by the table resolution, progressing the value of the phase index by the value of the jump factor, selecting a value of a commutation vector from the lookup table that corresponds to the phase index, and loading the value of the commutation vector into a corresponding PWM comparator.

A method for switching interval modulation includes modulating an RF input data signal while generating and inserting additional pulses in transitions of the data signal. The additional pulses are structured to shift transition noise into higher order harmonics. Higher order harmonics are easily filtered. The generating is conducted in the digital domain. The additional pulses can be used to simplify the transmit chain through optical modulators and improve the signal integrity over long distances, can be applied at the output of a transmitter to filter power amplifier distortion, and can be appplied to non-linear RF over fiber for a distributed MIMO system.

One or more embodiments relate to a circuit that can be used to prevent cross conduction in an SMPS including multiple half-bridge modules connected in parallel to a single output inductor and driven by a single pulse width modulation (PWM) signal. According to certain aspects, each high-side driver and low-side driver in a single half-bridge module is synchronized in their switching with corresponding high-side drivers and low-side drivers in other half-bridge modules.

An encoding modulation method and transmitter are described. The method includes: oversampling and noise-shaping received multi-bit data to obtain N bits of data; using the N bits of data as a lookup table address to obtain a PWM puke modulation signal; multiplexing synthetic orthogonal (IQ) complex data of the PWM pulse modulation signal to be real number signal data; and converting the multiplexed real number signal data to an analog signal for power amplification and output, N being an integer representing a smaller number of bits than the received multi-bit data.

A method for switching interval modulation includes modulating an RF input data signal while generating and inserting additional pulses in transitions of the data signal. The additional pulses are structured to shift transition noise into higher order harmonics. Higher order harmonics are easily filtered. The generating is conducted in the digital domain. The additional pulses can be used to simplify the transmit chain through optical modulators and improve the signal integrity over long distances, can be applied at the output of a transmitter to filter power amplifier distortion, and can be applied to non-linear RF over fiber for a distributed MIMO system.