Abstract: A light-to-digital converter (2) comprises a light-to-current converter (10); a current integrator (4) with an integrator output (30) resettable to a baseline level; and a counter (18) with a digital output (26), wherein the light-to-current converter (10) is switchably connectable as a positive integration input to the current integrator (4), for, during a light-collecting phase (404-406), integrating a current from the light-to-current converter (10), the integrator output (30) starting from the baseline value and ending at a value to be digitized; a reference current source (14) is switchably connectable as a negative integration input to the current integrator (4), for, during a counting phase (406-408) subsequent to the light-collecting phase (404-406), integrating a reference current from the reference current source (14), the integrator output (30) starting from the value to be digitized and ending at the baseline value, the time spent integrating the reference current corresponding to the value to be

Abstract: Front-end circuitry is difficult to design for high sample rate, wide bandwidth receivers with high performance requirements on noise and linearity. One exemplary front-end circuitry is integrated on-chip with the RF ADC in a receiver, and the circuitry implements ESD protection, attenuation, and gain. The circuitry includes a multi-tap filter with LC circuits, and the filter implements a highly linear filter. Advantageously, the capacitors in the LC circuits are also used for ESD protection. Additionally, tunable attenuator cells are implemented across the multi-tap filter to provide a wide range of variable attenuation. The circuitry can further include a fixed or variable gain stage at the output. The resulting circuitry offers variable gain and attenuation while meeting bandwidth, noise, and linearity requirements.

Abstract: High-performance radio frequency analog-to-digital converters (RF ADCs) demand high bandwidth, high linearity, and low noise input amplifiers. A Class-AB amplifier, including common-gate transistor devices and common-source transistor devices operating in parallel, offers high bandwidth and high linearity, while offering lower power operation when compared to Class-A amplifiers. The Class-AB amplifier can be followed by a Class-AB unity gain buffer comprising common-source transistor devices to provide additional isolation for the RF ADC from the circuitry preceding the Class-AB amplifier.

Abstract: High-performance radio frequency analog-to-digital converters (RF ADCs) demand high bandwidth, high linearity, and low noise input amplifiers. A Class-AB amplifier, including common-gate transistor devices and common-source transistor devices operating in parallel, offers high bandwidth and high linearity, while offering lower power operation when compared to Class-A amplifiers. The Class-AB amplifier can be followed by a Class-AB unity gain buffer comprising common-source transistor devices to provide additional isolation for the RF ADC from the circuitry preceding the Class-AB amplifier.

Abstract: A light-to-digital converter (2) comprises a light-to-current converter (10); a current integrator (4) with an integrator output (30) resettable to a baseline level; and a counter (18) with a digital output (26), wherein the light-to-current converter (10) is switchably connectable as a positive integration input to the current integrator (4), for, during a light-collecting phase (404-406), integrating a current from the light-to-current converter (10), the integrator output (30) starting from the baseline value and ending at a value to be digitized; a reference current source (14) is switchably connectable as a negative integration input to the current integrator (4), for, during a counting phase (406-408) subsequent to the light-collecting phase (404-406), integrating a reference current from the reference current source (14), the integrator output (30) starting from the value to be digitized and ending at the baseline value, the time spent integrating the reference current corresponding to the value to be