Category Archives: Circuit Analysis

Current-Mode-Logic (CML) Latch

Posted on January 5, 2021 by Dai

It’s a rather old topic and one can find many good references. In this post, I will write down some of my basic understandings on this circuit. Operation of CML latch Figure 1 shows a simplified block diagram of divider-by-2 … Continue reading →

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Basics On Active-RC Low-Pass Filters

Posted on February 19, 2020 by Dai

Just some basic understandings on analog filters which is inspired by ‘The Guru’ in our company. To clarify my thoughts, I will write in the format of Q&A. There are four questions to answer: What do we dream for a … Continue reading →

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Ringing in Step Response

Posted on March 13, 2018 by Dai

Is it possible to tell the stability of a negative-feedback circuit by just looking at its step response? The answer is yes. In this post, I will try to find the relationship between phase margin and ringing in step response. I … Continue reading →

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Capacitor as a Discrete-Time Resistor

Posted on October 29, 2017 by Dai

Prof. Ali has a column called “Circuit Intuitions” in the IEEE Solid-State Circuits Magazine. This time he wrote about capacitor as a resistor, which is quite helpful for me to understand this property recognized by James Clerk Maxwell 140 years … Continue reading →

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A Brief Review On the Orders of PLL

Posted on August 11, 2017 by Dai

The simplest PLL, as is shown in Fig.1, consists of a phase detector (PD) and a voltage controlled oscillator (VCO). Via a negative feedback loop, the PD compares the phases of OUT and IN, generating an error voltage that varies … Continue reading →

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