China
Africa
Explore chapters and articles related to this topic
Image-Processing Engines
Published in Junichi Nakamura, Image Sensors and Signal Processing for Digital Still Cameras, 2017
The NuCORE NDX-1260 AFE device2 is used in high-end still and video consumer/professional camera applications. A block diagram of the AFE is shown in Figure 9.9. It is designed to minimize color noise and digital artifacts to allow digital cameras to capture a truer representation of the actual subject being photographed. Also, it features the industry’s highest throughput of 50 megasamples (pixels) per second. The CDS circuit employs a differential amplifier design, which ensures power-supply rejection. It also converts the inherently single-ended input from the CCD image sensor to a differential output signal to improve the signal-processing performance of the downstream blocks in the AFE. A programmable gain amplifier (PGA), prior to a precision ADC, takes the CDS’s differential output and amplifies it under the control of an 8-b programmable word from 0 to 32 dB in 0.125-dB steps.
Passive Component Switching Circuits
Published in Steve Moore, Designing with Analog Switches, 2020
The programmable gain amplifier (PGA) uses the same principles as the attenuator circuits, only this time the attenuator is placed in the feedback loop of an op amp, as shown in Figure 7.4. The expression for the gain of this non-inverting op amp is given by the expression Av = 1 + (Rf/Rg).
A fully integrated 2TX–4RX 60-GHz FMCW radar transceiver for short-range applications
Published in International Journal of Electronics, 2023
Dušan P. Krčum, Đorđe P. Glavonjić, Veljko R. Mihajlović, Lazar V. Saranovac, Vladimir M. Milovanović, Ivan M. Milosavljević
A fully programmable baseband processing chain is available in the receiver path of the proposed MIMO system. A detailed description of topology including measured results is given in Obradović et al. (2020), so only a brief overview is given here for the sake of completeness. Baseband circuitry consists of the programmable gain amplifier (PGA) which can be used in low-noise and high-linearity mode. In addition to 0–60 dB fine gain tuning, the baseband is designed to be able to separate beat tones using low-pass or bandpass mode. This is done using a combination of -order low-pass and -order high-pass active RC filters. Beat tones within the range from 100 kHz up to 1.3 MHz can be processed. Assuming sawtooth ramp with the slope of 200 , these frequencies correspond to target range of 7.5 cm to 0.975 , respectively. Farther targets can easily fit to proposed frequency range by decreasing slope of the transmitted chirps. Finally, the output of the baseband circuitry is a highly capable driver that delivers signals to the off-chip ADCs.