Using Deep N Wells in Analog Design
May 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.
Layout Dependent & LOD Effects in Analog Design
Oct 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 ...
The Basics of SerDes (Serializers/Deserializers) - Planet Analog
Sep 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.
Operational Transconductance Amplifier (OTA) - Planet Analog
Aug 17, 2022 · Operational transconductance amplifiers (OTAs) have become essential building blocks of many modern analog and mixed signal circuits. OTAs are used as a key element in a wide variety of circuits that benefit from voltage control. In essence, an OTA is a direct-coupled differential voltage-controlled current source (DVCCS) with high output ...
Matching in Analog Layout
May 20, 2014 · One common matching technique is known as common centroid. In this case, two devices to be matched are split into several fingers and placed in a pattern, as shown in Figure 1. The key points are that the centroids of each device should coincide, the devices should be symmetrical, their orientation should be the same, and the array should be as ...
IC Performance: Challenges in Layout with CMOS Technology Nodes
Feb 14, 2017 · Besides the known benefits of advanced CMOS technology nodes, which are moving towards the ultra-small nanometer range, the layout work for mixed-signal circuits is becoming more and more challenging. Several challenges, which were quite tamed in earlier technology nodes, are coming up as a bottleneck for design performance and robustness in ...
An Analog Tutorial: Current sources - Planet Analog
Mar 28, 2019 · James Bryant, retired Analog Devices ‘guru’ says, “…current outputs offer advantages in a number of situations, including analog current-loop signaling (0 mA to 20 mA and 4 mA to 20 mA) in high-noise environments, and level shifting an analog signal across a large potential difference without the use of optical or magnetic isolation techniques.” (See Reference 4)
Miller Effect and Theorem - Planet Analog
Jul 3, 2017 · Miller’s theorem readily generalizes to amplifiers in which Rf is replaced by a reactance, such as a capacitor. Because of the Miller effect, a common-emitter (CE) transistor stage with base-collector capacitance, Cbc will cause this capacitance to appear as 1 + K greater at the base, where K is the base-to-collector voltage gain of the CE stage.
Peak Detector: A Classic Analog Circuit Still in Wide Use
Dec 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 ...
Signal Chain Basics #148: Understanding the impact of offsets in …
May 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.