Novel solutions for calibration of a digital-to-analog converter (DAC). Some solutions allow for the calibration of a DAC without an isolation switch and/or calibration based on signal measurements taken at the output stage of a device comprising the DAC.

An orthogonal frequency division multiplexing (OFDM) transmitter maps a digital level into I and Q components. The transmitter uses every other digital level as an I or Q component or divides the MSBs and LSBs of a digital level into the I and Q components. An analog OFDM transmitter uses a pair of input analog levels as the I and Q components. An inverse FFT outputs a complex value and OFDM symbols are transmitted. An inverse FFT may also output a real value using complex conjugates. An optional encoder encodes digital or analog samples into L levels using N orthogonal codes before input into the OFDM transmitter. OFDM receivers receive the OFDM signal and output digital or analog samples. Video signals are input into a distributor that distributes analog or digital samples into vectors, each vector input into an OFDM transmitter that transmits to a corresponding receiver.

An orthogonal frequency division multiplexing (OFDM) transmitter maps a digital level into I and Q components. The transmitter uses every other digital level as an I or Q component or divides the MSBs and LSBs of a digital level into the I and Q components. An analog OFDM transmitter uses a pair of input analog levels as the I and Q components. An inverse FFT outputs a complex value and OFDM symbols are transmitted. An inverse FFT may also output a real value using complex conjugates. An optional encoder encodes digital or analog samples into L levels using N orthogonal codes before input into the OFDM transmitter. OFDM receivers receive the OFDM signal and output digital or analog samples. Video signals are input into a distributor that distributes analog or digital samples into vectors, each vector input into an OFDM transmitter that transmits to a corresponding receiver.

Systems, compute-implemented methods, and computer program products to facilitate automated waveform validation are provided. According to an embodiment, a system can comprise a processor that executes computer executable components stored in memory. The computer executable components comprise a waveform comparison component that compares a digital conversion of an analog signal to a reference signal.

A method includes providing, by a signal source circuit of a sensing circuit, a signal to a sensor via a conductor. When the sensor is exposed to a condition and is receiving the signal, an electrical characteristic of the sensor affects the signal. The signal includes at least one of: a direct current (DC) component and an oscillating component. When the sensing circuit is in a noisy environment, transient noise couples with the signal to produce a noisy signal. The method further includes comparing, by a transient circuit of the sensing circuit, the noisy signal with a representation of the noisy signal. When the noisy signal compares unfavorably with the representation of the noisy signal, supplying, by the transient circuit, a compensation signal to the conductor. A level of the compensation signal corresponds to a level at which the noisy signal compares unfavorably with the representation of the noisy signal.

There are provided a signal generation unit that generates a predetermined digital signal, a level conversion unit that converts a level of the digital signal generated by the signal generation unit, a DA converter that converts the digital signal of which the level is converted by the level conversion unit into an analog signal in a predetermined intermediate frequency bandwidth, and a control unit that creates correction data for correcting a linearity of a level of an output signal of the DA converter for all frequencies to be used, based on actual data which is data of a level of an actual output signal when a setting of the level of the output signal of the DA converter is changed at a predetermined level interval, at a predetermined frequency, and converts a level of an input signal of the DA converter with the correction data.

A digital-analog converter of the disclosure converts digital image data to generate analog data signals. The digital-analog converter includes a voltage divider which generates a plurality of gamma reference voltages based on a first reference voltage and a second reference voltage; a global ramp including a plurality of gamma decoders which generates a plurality of global gamma voltages based on the gamma reference voltages; a decoder which selects one of the global gamma voltages according to the digital image data to generate the analog data signals; and a ramp controller which turns off at least some of the gamma decoders based on the digital image data.

A digital-analog converter of the disclosure converts digital image data to generate analog data signals. The digital-analog converter includes a voltage divider which generates a plurality of gamma reference voltages based on a first reference voltage and a second reference voltage; a global ramp including a plurality of gamma decoders which generates a plurality of global gamma voltages based on the gamma reference voltages; a decoder which selects one of the global gamma voltages according to the digital image data to generate the analog data signals; and a ramp controller which turns off at least some of the gamma decoders based on the digital image data.

Embodiments disclosed herein may reduce or even eliminate spurs introduced into the signals during analog to digital or digital to analog conversions. The spurs may be introduced by components such as clocks of the converter circuits. In an analog to digital conversion, the input signal may be split into two parts: the first portion passing through a first analog to digital converter (ADC) and an inverted second portion passing through a second ADC. A digital subtractor may subtract the output of the second ADC from the output of the first ADC converter thereby reducing the spurs. In digital to analog conversion, a digital input is passed through a first digital to analog converter (DAC) and an inverted digital input is passed through a second DAC. The output of the second DAC is inverted and combined with the output of the first DAC to reduce the spurs.

Embodiments disclosed herein may reduce or even eliminate spurs introduced into the signals during analog to digital or digital to analog conversions. The spurs may be introduced by components such as clocks of the converter circuits. In an analog to digital conversion, the input signal may be split into two parts: the first portion passing through a first analog to digital converter (ADC) and an inverted second portion passing through a second ADC. A digital subtractor may subtract the output of the second ADC from the output of the first ADC converter thereby reducing the spurs. In digital to analog conversion, a digital input is passed through a first digital to analog converter (DAC) and an inverted digital input is passed through a second DAC. The output of the second DAC is inverted and combined with the output of the first DAC to reduce the spurs.