Answers question in I/Q Noise figure, and on how to do stability in Cadence ADE.
Author Archives: Poojan Wagh
Reader Round-Up (vol 1)
Posted in Analog Professional Tagged cadence, downconverter, noise figure, quadrature, spectre, stability Leave a comment
Chopping to alleviate IM2,
IM2 Consider the fully differential amplifier shown below:
Posted in Analog Professional Tagged chopping, IM2, IP2, matching, mixer, pseudonoise, spread spectrum 3 Comments
You want latches? We got latches | Flip-Flop Design
The two inverters chasing their tail to the right of the input inverters represent a memory unit (i.e. a latch). When one output is high the other one is forced low. This low output then reinforces the first output being high. These two inverters form a positive feedback system.
MOS Diffusion Parasitics
I wanted to go through a bit of illustration with regard to minimizing MOS diffusion parasitics. I will start with the basics of detailing the MOS semiconductor structure. From there, I’ll display some layout configurations that minimize MOS diffusion capacitance.
Posted in Analog Professional Tagged CMOS, diffusion, fully custom, high speed logic, layout, parasitics 1 Comment
Minimizing leakage for high-performance CMOS circuits
I was asked a question on how to reduce leakage for digital circuits. I started by detailing process options that effect leakage, each effective both leakage and circuit performance. In this article, I will detail two methods to reduce leakage while maintaining circuit performance. I assume that the circuit at hand requires the highest performance [...]
Typical CMOS device/process options
I received an inquiry on how to reduce leakage. I will cover how to do so in a future article. However, before I do, let’s go over some process options that effect leakage.
Posted in Digital Professional 1 Comment
Unity STF | A sigma-delta linearization method
In a previous post, I discussed the trade-offs in linearity of several continuous-time sigma-delta schemes. In this post, I will describe a method that linearizes the sigma-delta noise-shaping filter (NSF). That is, the scheme presented in this article greatly suppresses the linearity requirements on the noise-shaping filter. This method applies to both discrete-time and continuous-time [...]
Posted in Analog Professional Tagged continuous time, continuous time sigma-delta, linearity, sigma delta Leave a comment
Continuous time sigma-delta ADC noise shaping filter circuit architectures
The continuous-time sigma-delta (CTSD) analog-to-digital converter (ADC) is a class of sigma-delta analog-to-digital converters that utilize a continuous-time noise-shaping filter (NSF | H(s)). In this post, I analyze a few noise-shaping filter (NSF) architectures that affect highly linear CTSD ADC’s.
Posted in Analog Professional Tagged active RC, ADC, continuous time, Gm-C, linearity, noise shaping filter, sigma delta 5 Comments