An open-loop 20 GSps track-and-hold amplifier （THA） using fully-differential architecture to mitigate common-mode noise and suppress even-order harmonics is presented. CMOS switch and dummy switches are adopted to a...An open-loop 20 GSps track-and-hold amplifier （THA） using fully-differential architecture to mitigate common-mode noise and suppress even-order harmonics is presented. CMOS switch and dummy switches are adopted to achieve high speed and good linearity. A cross-coupled pair is used in the input buffer to suppress the charge injection and clock feedthrough. Both the input and output buffers use an active inductor load to achieve high signal bandwidth. The THA is realized with 0.18/zm SiGe BiCMOS technology using only CMOS devices at a 1.8 V voltage supply and with a core area of 0.024 mme. The measurement results show that the SFDR is 32.4 dB with a 4 GHz sine wave input at a 20 GSps sampling rate, and the third harmonic distortion is -48 dBc. The effective resolution bandwidth of the THA is 12 GHz and the figure of merit is only 0.028 mW/GHz.展开更多
针对软件无线电架构的导航接收机对模数转换器的高输入带宽、高速及低功耗的需求,通过集成低功耗宽带采样保持电路及新型非二进制权重的电容阵列数模转换器电路,采用逐次逼近型模数转换器架构,设计实现了一款射频直接采样SAR模数转换器...针对软件无线电架构的导航接收机对模数转换器的高输入带宽、高速及低功耗的需求,通过集成低功耗宽带采样保持电路及新型非二进制权重的电容阵列数模转换器电路,采用逐次逼近型模数转换器架构,设计实现了一款射频直接采样SAR模数转换器。采用55 nm CMOS工艺电路设计、版图设计、仿真及硅流片验证,测试结果表明,该ADC实现了34 dB SNDR、36 dB SFDR和1.6 GHz的模拟输入信号带宽。该ADC的版图面积为670μm×390μm,功耗为9.6 mW。展开更多
A sub-sampling 4-bit 1.056-GS/s flash ADC with a novel track and hold amplifier（THA） in 0.13μm CMOS for an impulse radio ultra-wideband（IR-UWB） receiver is presented.The challenge is in implementing a sub-samplin...A sub-sampling 4-bit 1.056-GS/s flash ADC with a novel track and hold amplifier（THA） in 0.13μm CMOS for an impulse radio ultra-wideband（IR-UWB） receiver is presented.The challenge is in implementing a sub-sampling ADC with ultra-high input signal that further exceeds the Nyquist frequency.This paper presents,to our knowledge for the second time,a sub-sampling ADC with input signals above 4 GHz operating at a sampling rate of 1.056 GHz.In this design,a novel THA is proposed to solve the degradation in amplitude and improve the linearity of signal with frequency increasing to giga Hz.A resistive averaging technique is carefully analyzed to relieve noise aliasing.A low-offset latch using a zero-static power dynamic offset cancellation technique is further optimized to realize the requirements of speed,power consumption and noise aliasing.The measurement results reveal that the spurious free dynamic range of the ADC is 30.1 dB even if the input signal is 4.2 GHz sampled at 1.056 GS/s.The core power of the ADC is 30 mW,excluding all of the buffers,and the active area is 0.6 mm^2.The ADC achieves a figure of merit of 3.75 pJ/conversion-step.展开更多
Tow different computer calculation methods for distortion of the wide-band diode bridge track and hold amplifier (THA) are presented based on a high frequency Schottky diode model. One of the computer programs calcula...Tow different computer calculation methods for distortion of the wide-band diode bridge track and hold amplifier (THA) are presented based on a high frequency Schottky diode model. One of the computer programs calculates the distortion of weekly nonlinear THA based on the KCL and the nonlinear-current method. The other calculates the weekly nonlinear distortion by using a Volterra series method and a nodal formulation. Comparative calculation results for the diode bridge THA have shown good agreement with these two computer program calculation methods, whereas the overall computational efficiency of the nonlinear-current method is better than that of the nodal formulation method in a special evaluation.展开更多
基金supported by the PhD Programs Foundation of Ministry of Education of China(No.2009009211001)the Important National Science&Technology Specific Projects(No.2010ZX03006-003-02)
文摘An open-loop 20 GSps track-and-hold amplifier （THA） using fully-differential architecture to mitigate common-mode noise and suppress even-order harmonics is presented. CMOS switch and dummy switches are adopted to achieve high speed and good linearity. A cross-coupled pair is used in the input buffer to suppress the charge injection and clock feedthrough. Both the input and output buffers use an active inductor load to achieve high signal bandwidth. The THA is realized with 0.18/zm SiGe BiCMOS technology using only CMOS devices at a 1.8 V voltage supply and with a core area of 0.024 mme. The measurement results show that the SFDR is 32.4 dB with a 4 GHz sine wave input at a 20 GSps sampling rate, and the third harmonic distortion is -48 dBc. The effective resolution bandwidth of the THA is 12 GHz and the figure of merit is only 0.028 mW/GHz.
文摘基于0.7μm、ft=280 GHz的InP HBT工艺设计了一种双开关宽带超高速采样保持电路。芯片面积1.5 mm×1.8 mm,总功耗小于2.1 W。仿真结果表明,电路可以在5 GS/s采样速率下正常工作。当采样速率分别为5 GS/s和1 GS/s时,在输入信号功率为4 d Bm的情况下,采样带宽分别为16 GHz和20 GHz;在输入信号功率为4 d Bm且其频率小于5 GHz的情况下,电路的SFDR分别不低于43 d Bc和50 d Bc。
文摘针对软件无线电架构的导航接收机对模数转换器的高输入带宽、高速及低功耗的需求,通过集成低功耗宽带采样保持电路及新型非二进制权重的电容阵列数模转换器电路,采用逐次逼近型模数转换器架构,设计实现了一款射频直接采样SAR模数转换器。采用55 nm CMOS工艺电路设计、版图设计、仿真及硅流片验证,测试结果表明,该ADC实现了34 dB SNDR、36 dB SFDR和1.6 GHz的模拟输入信号带宽。该ADC的版图面积为670μm×390μm,功耗为9.6 mW。
基金Project supported by the National High Technology Research and Development Program of China(No.2009AA01Z261)the State Key Laboratory of Wireless Telecommunication,Southeast University
文摘A sub-sampling 4-bit 1.056-GS/s flash ADC with a novel track and hold amplifier（THA） in 0.13μm CMOS for an impulse radio ultra-wideband（IR-UWB） receiver is presented.The challenge is in implementing a sub-sampling ADC with ultra-high input signal that further exceeds the Nyquist frequency.This paper presents,to our knowledge for the second time,a sub-sampling ADC with input signals above 4 GHz operating at a sampling rate of 1.056 GHz.In this design,a novel THA is proposed to solve the degradation in amplitude and improve the linearity of signal with frequency increasing to giga Hz.A resistive averaging technique is carefully analyzed to relieve noise aliasing.A low-offset latch using a zero-static power dynamic offset cancellation technique is further optimized to realize the requirements of speed,power consumption and noise aliasing.The measurement results reveal that the spurious free dynamic range of the ADC is 30.1 dB even if the input signal is 4.2 GHz sampled at 1.056 GS/s.The core power of the ADC is 30 mW,excluding all of the buffers,and the active area is 0.6 mm^2.The ADC achieves a figure of merit of 3.75 pJ/conversion-step.
文摘Tow different computer calculation methods for distortion of the wide-band diode bridge track and hold amplifier (THA) are presented based on a high frequency Schottky diode model. One of the computer programs calculates the distortion of weekly nonlinear THA based on the KCL and the nonlinear-current method. The other calculates the weekly nonlinear distortion by using a Volterra series method and a nodal formulation. Comparative calculation results for the diode bridge THA have shown good agreement with these two computer program calculation methods, whereas the overall computational efficiency of the nonlinear-current method is better than that of the nodal formulation method in a special evaluation.
