Wang Zhen – China Information Communication Technology：
In this week’s collaborative learning, I systematically studied Chapter 7 of the book Analog-to-Digital Conversion, which mainly includes topics on time-domain and frequency-domain sampling, modulation and chopping, recovery of sampled data, noise, jitter, etc., further understanding the sampling circuits in ADC.
Bu Zeng – Huawai:
This week, I studied Chapter 7 on JITTER and time-domain filtering. The physical path (RC) can cause CLOCK SKEW, while the noise from oscillators and PLL can introduce JITTER. Both SKEW and JITTER can affect the accuracy of clock signals, thereby impacting SNR.
FIR and IIR filters process signals in the discrete time domain, primarily utilizing DELAY elements. A unit of DELAY can be represented as Z-1. We can start with comb filters, but further in-depth study is needed.
Chen Qing – Huachuang Micro:
This week’s main study content was from sections 7.6 to 7.7
1. Psychological Discussion
This part was relatively challenging to read, especially the various filters in the discrete time domain, but it has broadened my knowledge, though there wasn’t much to ponder.
2. Key Knowledge Points Summary
1. Jitter
Clock deviation and jitter both affect the sampling moments, where clock deviation is deterministic. The author discussed little about it, mainly introducing the impact of jitter on sampling, describing its effect on sampling amplitude and overall signal-to-noise ratio. Subsequently, the author provided principles for jitter introduced by pulse drive design. To reduce jitter, the latest research involves laser sampling, which has a jitter of about 3-10fsrms.
2. Discrete Time Domain Filters
This type of filter is commonly used in sigma-delta modulators, with common types being finite impulse response filters (FIR Filter), half-band filters (Half-Band Filters), and infinite impulse response filters (IIR Filters).
Zhou Ziyang – Suzhou Kaiweite: (missing)