Using Deep N Wells in Analog Design
WEBMay 7, 2015 — In summary, the use of deep N well devices can significantly reduce noise coupling between sensitive analog areas and more noisy digital regions in mixed-signal designs. ESSDERC 2012. Analog layout: Why wells, taps, and guard rings are crucial. Automating Analog Layout. Additional structures in analog layout beyond schematic.
The Basics of SerDes (Serializers/Deserializers) - Planet Analog
WEBSep 16, 2010 — In a serial bus, a device called SerDes (Serializer/ Desrializer) is used to transmit and receive data over the serial link. In essence, a SerDes is a serial transceiver which converts parallel data into a serial data stream on the transmitter side and converts the serial data back to parallel on the receiver side.
Signal Chain Basics #148: Understanding the impact of offsets in …
WEBMay 29, 2019 — Always observe both the differential- and common-mode output signals to diagnose offset effects. The effects of the differential signal will not show any changes in the common-mode signal; conversely, the common-mode signal will not show any changes in the differential signal.
Layout Dependent & LOD Effects in Analog Design
WEBOct 9, 2014 — This stress affects carrier mobility in the devices and, hence, current. This is known as “length of diffusion” or LOD effect, where the characteristics of a device vary according to the distance of its gate from the diffusion edge. To design with LDE effects, various layout techniques can be used: Use similar diffusion size, shape ...
Matching in Analog Layout - Planet Analog
WEBMay 20, 2014 — Matching in Analog Layout. Analog circuits often use structures like differential pairs and current mirrors, where the matching of device characteristics such as the threshold voltage V t is important. Circuits using these structures with device threshold differences of a few millivolts or less can determine the performance and yield of a design.
Peak Detector: A Classic Analog Circuit Still in Wide Use
WEBDec 5, 2013 — A relative of the peak detector is the crystal (diode) radio, which uses a diode to demodulate (detect) a basic amplitude-modulated broadcast signal; see Figure 3. Figure 3. The venerable crystal radio circuit is a self-powered envelope detector, and a precursor of the peak detector. This circuit is an envelope detector that tracks the overall ...
Temperature Coefficients: Negative vs Positive - Planet Analog
WEBApr 28, 2017 — The polarity of the temperature coefficient is easy to spot in a graph of resistance versus temperature. As temperature increases, a positive slope indicates a positive temperature coefficient. A negative slope indicates a negative temperature coefficient. In this blog we’ll look at the temperature coefficients of popular power semiconductors ...
Latchup Prevention In CMOS - Planet Analog
WEBJan 14, 2015 — How To Avoid Latch-Up In CMOS. There are several ways to reduce the possibility of latchup: Reduce the beta of either or both parasitic devices. In practice this can be achieved by increasing the spacing between the devices, which increases the width of the lateral device. However, such increased spacing reduces packing density.
Planet Analog - All Signal No Noise
WEB4 days ago — 2021 (119) 2020 (44) Planet Analog provides an online community for semiconductor and system designers/engineers interested in advancing analog design techniques.
An Analog Tutorial: Current sources - Planet Analog
WEBMar 28, 2019 — Figure 3. The Wilson Current Source is another three-transistor architecture current source. All transistors are identical (this is easy in an IC on a monolithic substrate) (See Reference 3) Adding another transistor (T4) will improve the accuracy and dynamic range of the current source as seen in Figure 4. Figure 4.