An 11b 40MS/s charge pump and comparator based pipelined ADC with variable reset voltages

A low‐power 10‐bit CCP‐based pipelined ADC using a multi‐level variable current source MDAC and an ultra‐low‐power double‐tail dynamic latch

“…The conventional CCP circuit is depicted in Figure 4 4 . As the opamp is a power‐hungry block, the OTA in opamp‐based structure is replaced with a main detection comparator (SC) and a CCS in a typical CCP structure in order to reduce the power consumption of each stage.…”

“…Amplifying the residue voltage with low power consumption is the main challenge in pipelined ADCs. Residue amplification in every stage can increase the accuracy by amplifying the signal into the full‐scale range 4,10 . Generating V RES is done by multiplying digital‐to‐analog converter (MDAC) block.…”

“…Generating V RES is done by multiplying digital‐to‐analog converter (MDAC) block. As shown in Figure 2B, the MDAC block is a switched‐capacitor circuit, which is composed of a sample‐and‐hold (S/H) block, a low‐resolution DAC (sub‐DAC), a subtraction block, and an amplification block 4 …”

“…Afterward, a new architecture named current‐charge‐pump (CCP) technique has been proposed 4,11,20 . The fundamental difference between CCP and CBSC structures is that in CCP, the inputs of the main comparator are connected to V RES and V OUT , while in the CBSC technique, the inputs of the comparator are connected to V RES and V cm to create the virtual ground condition.…”

“…3 As shown in Figure 1, the pipelined ADC has the best performance among other data converters for applications features medium to high resolution (8-16 bits), and sampling rates from a MS/s to GS/s and low-power consumption. 4 Nowadays, the demand for 10-bit and up to 10-MHz data converters has been increased, so the pipelined ADC has proven to be the most efficient architecture among other data converter structures. 5 Because of the mentioned characteristics, pipelined ADC can be used in many different applications such as instrumentation application (oscilloscope, spectrum analyzer, and medical imaging), video, radar, communication, microprocessor-based instrumentation system, and also consumer electronics (digital camera, DVD, and high-definition TV).…”