Theoretical study and demonstration of photonic asynchronous first-order delta-sigma modulator for converting analog input to NRZ binary output

2015 ◽  
Vol 57 (3) ◽  
pp. 574-578 ◽  
Author(s):  
E. Reeves ◽  
P. Costanzo-Caso ◽  
A. Siahmakoun
Keyword(s):  
Theoretical Study ◽  
Analog Input ◽  
First Order ◽  
Binary Output ◽  
Delta Sigma Modulator ◽  
Delta Sigma

A novel structure of dithered nested digital delta sigma modulator with low-complexity low-spur for fractional frequency synthesizers

2016 ◽  
Vol 35 (1) ◽  
pp. 157-171 ◽  
Author(s):  
Seyed Ali Sadat Noori ◽  
Ebrahim Farshidi ◽  
Sirus Sadoughi
Keyword(s):  
Frequency Synthesizer ◽  
Frequency Synthesizers ◽  
Linear Feedback ◽  
Hardware Complexity ◽  
Order Error ◽  
Content Type ◽  
First Order ◽  
Fractional Frequency ◽  
Delta Sigma Modulator ◽  
Delta Sigma

Purpose – Digital Delta Sigma Modulator (DDSM) is used widely in electronic circuits including Radars, class-D power amplifiers and fractional frequency synthesizers. The purpose of this paper is to propose an implementation for MASH DDSMs named as Multi Modulus Reduced Complexity (MMRC) architecture. Design/methodology/approach – This architecture will use a very simple pseudorandom Linear Feedback Shift Register (LFSR) dither signal with period N_d to randomize the digital MMRC modulator used for fractional frequency synthesizers. Using error masking methodology, the MMRC modulator can decrease the hardware consumption and increase accuracy of the fractional frequency synthesizer. Rules for selecting the appropriate word lengths of the constituent MMRC modulator are derived. Findings – This paper contains three modulators. The first stage modulator is a variable modulus First Order Error Feedback Modulator and has a programmable modulus M1 that is not a power of two. The second and third stage modulators are the first order pseudorandom LFSR dithered MASH 1-1 and modified MASH 1-1-1, which have conventional modulo M2, M3, respectively. With optimum selection modulus M1, the new structure can synthesize the desired frequency exactly. Simulation results confirm the theoretical predictions. Also the results of circuit implementation proposed method reports 13 per cent reduction in hardware. Originality/value – This paper for the first time proposes a nested sigma delta modulator with a pseudorandom shaped dither signal which reduced hardware complexity and increased the period of output signal. This modulator is exploited in the fractional frequency synthesizer to the output frequency can be set more accurately.

A 10-Gb/s Receiver With Track-and-Hold-Type Linear Phase Detector and Charge-Redistribution First-Order $\Delta\Sigma$ Modulator in 90-nm CMOS

2009 ◽  
Vol 44 (12) ◽  
pp. 3539-3546 ◽  
Author(s):  
Koji Fukuda ◽  
Hiroki Yamashita ◽  
Fumio Yuki ◽  
Goichi Ono ◽  
Ryo Nemoto ◽  
...  
Keyword(s):  
Phase Detector ◽  
Linear Phase ◽  
Charge Redistribution ◽  
First Order ◽  
Delta Sigma Modulator ◽  
Delta Sigma

A Delta-Sigma Modulator Using a Non-uniform Quantizer Adjusted for the Probability Density of Input Signals

2012 ◽  
Vol E95.B (7) ◽  
pp. 2257-2265
Author(s):  
Toru KITAYABU ◽  
Mao HAGIWARA ◽  
Hiroyasu ISHIKAWA ◽  
Hiroshi SHIRAI
Keyword(s):  
Probability Density ◽  
Delta Sigma Modulator ◽  
Delta Sigma ◽  
Input Signals
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