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.
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.
SIGNAL CHAIN BASICS #56: Clock Jitter Demystified ... - Planet …
WEBAug 15, 2011 · Phase noise is a frequency domain measurement that is the power spectral density of a signal’s phase. To better understand the definition of phase noise, let’s consider how it is measured. Figure 2 shows a typical phase noise measurement setup in which a clock oscillator is connected to a spectrum analyzer. Figure 2: Phase noise measurement.
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
WEBMay 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 …
Analog layout: Why wells, taps, and guard rings are crucial
WEBAug 23, 2021 · An N-well is constructed around and beneath the device’s P-well. The N-channel device operates in the P-well. Both the P-well and the deep N-well need to be tapped, but in many cases, both wells are protected with guard rings. This means that the device has two rings around it, greatly improving the isolation of …
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.
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 ...
Operational Transconductance Amplifier (OTA) - Planet Analog
WEBAug 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 ...
ADC Guide, Part 13: Input Impedance - Planet Analog
WEBMar 18, 2013 · As we can see in Figure 1 , the input impedance of an ADC is not purely resistive. A switched capacitor input is basically the sample and hold stage of the ADC. Figure 2 shows the simplified sample and hold circuit. The capacitive part of the input impedance originates primarily by virtue of the sampling capacitor (C SAMPLE in …
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