Patents Assigned to AmpliPHY Technologies Limited
-
Patent number: 11575356Abstract: A fully-differential two-stage operational amplifier circuit is provided, and it includes a first-stage amplification circuit, a second-stage amplification circuit, a common-mode signal acquisition circuit, a common-mode feedback circuit and a bias circuit. The first-stage amplification circuit has a telescopic structure and receives differential input signals INP and INN. The second-stage amplification circuit has a common-source structure and outputs differential output signals OUTP and OUTN. The common-mode signal acquisition circuit receives differential output signals, and outputs an operational amplifier output common-mode signal VCMO. The common-mode feedback circuit outputs common-mode feedback signals VB1 and VB2 to the first-stage amplifier circuit and the second-stage amplifier circuit respectively; The bias circuit outputs a bias voltage VB3 to the first-stage amplifier circuit, and outputs bias voltages VB4 and VB5 to the first-stage amplifier circuit respectively.Type: GrantFiled: April 29, 2022Date of Patent: February 7, 2023Assignee: AMPLIPHY TECHNOLOGIES LIMITEDInventors: Tianlin Cao, Hehong Zou, Zhiyang Wang, Sheng Huang, Qi Chen
-
Patent number: 11171618Abstract: A CMOS trans-impedance amplifier includes an inverting amplifier circuit and a feedback resistor. The inverting amplifier circuit includes an input end and an output end, and the feedback resistor is coupled therebetween. The inverting amplifier circuit includes at least three sequentially-connected amplifier units, and each amplifier unit includes at least three sequentially-connected nFETs, namely an input signal receiving part nFET, an intermediate part nFET and a DC signal receiving part nFET. A common connection terminal of the input signal receiving part nFET and the intermediate part nFET is configured to output an amplified voltage signal.Type: GrantFiled: December 13, 2019Date of Patent: November 9, 2021Assignee: AmpliPHY Technologies LimitedInventor: Hehong Zou
-
Patent number: 11099592Abstract: This invention provides a current self-checking regulation circuit based on voltage calibration including a bandgap reference unit, a self-calibration unit, a detection and regulation unit, current mirror units, and a current mirror control unit. The bandgap reference unit is configured to generate a voltage signal, the self-calibration unit is configured to respond to a digital signal of the detection and regulation unit and calibrate the voltage signal of the bandgap reference unit. The detection and regulation unit samples the reference current signal and a mirror current signal of the regulation group current mirror unit and generate a digital control signal according to the reference current signal. and the reference group current mirror unit responds to the digital control signal and outputs a regulated bias current signal meeting needs of the laser driver.Type: GrantFiled: January 14, 2019Date of Patent: August 24, 2021Assignee: AMPLIPHY TECHNOLOGIES LIMITEDInventors: Chih-yang Wang, Yichao He
-
Publication number: 20210058045Abstract: A CMOS trans-impedance amplifier includes an inverting amplifier circuit and a feedback resistor. The inverting amplifier circuit includes an input end and an output end, and the feedback resistor is coupled therebetween. The inverting amplifier circuit includes at least three sequentially-connected amplifier units, and each amplifier unit includes at least three sequentially-connected nFETs, namely an input signal receiving part nFET, an intermediate part nFET and a DC signal receiving part nFET. A common connection terminal of the input signal receiving part nFET and the intermediate part nFET is configured to output an amplified voltage signal.Type: ApplicationFiled: December 13, 2019Publication date: February 25, 2021Applicant: AmpliPHY Technologies LimitedInventor: Hehong ZOU
-
Patent number: 10756509Abstract: This invention provides an accurate current mirror circuit in a low voltage headroom applied to common-anode laser drivers, including a reference current detection unit, a tail current source unit, and a control unit. The reference current detection unit generates a bias voltage and a reference voltage according to a reference current from the reference current source; the tail current source unit receives the bias voltage and generate a mirror current accordingly; the control unit receives the reference voltage and an output voltage corresponding to the mirror current and carry out a feedback regulation to the bias voltage accordingly. In this invention, the reference voltage and the output voltage are locked at same level, and then the bias voltage is mirrored to generate the mirror current outputted to the laser, thus avoiding the problem of inaccurate current output caused by the offset of the control unit in the low voltage headroom.Type: GrantFiled: January 14, 2019Date of Patent: August 25, 2020Assignee: AMPLIPHY TECHNOLOGIES LIMITEDInventors: Hehong Zou, Tianlin Cao, Jie Lou, Zhuoyuan Li
-
Patent number: 10712761Abstract: This invention provides a multi-bit digitally controlled accurate current source circuit including a reference current detection unit, a voltage buffer unit, a digital logic control unit, a switch array unit, and a current source array unit. The reference current detection unit generates a first bias voltage according to a reference current; the voltage buffer unit receives the first bias voltage, and generate a buffer voltage accordingly; the digital logic control unit receives the buffer voltage, and generate a digital control signal accordingly; the switch array unit receives the digital control signal, and generate on-off signals accordingly; and the current source array unit receives and responds to the on-off signals so as to control turn-on and turn-off of the current sources in the current source array unit. In this invention, by adding only one voltage buffer, a cascode current source if formed, and an area saving accurate current source is realized.Type: GrantFiled: January 14, 2019Date of Patent: July 14, 2020Assignee: AMPLIPHY TECHNOLOGIES LIMITEDInventors: Tianlin Cao, Yichao He, Jie Lou, Qingping Li, Zhuoyuan Li
-
Patent number: 10707843Abstract: This invention provides a relaxation oscillator, including a first comparator, a second comparator, an SR latch, and a capacitor control module. Input ends of the two comparators are coupled with the capacitor control module and an external reference threshold voltage, and two output ends are coupled with the input ends of the SR latch; output ends of the SR latch are coupled with input ends of the capacitor control module; According to the external reference threshold voltage, a first comparison signal generated by the first comparator and a second comparison signal generated by the second comparator are inputted into the SR latch to generate a control signal. According to a bias current of the external bias current source and the control signal outputted by the SR latch, periodic charging and discharging of a first capacitor and a second capacitor are controlled to generate oscillating signals.Type: GrantFiled: January 14, 2019Date of Patent: July 7, 2020Assignee: AMPLIPHY TECHNOLOGIES LIMITEDInventors: Hehong Zou, Yichao He, Qingping Li
-
Publication number: 20200091897Abstract: This invention provides a relaxation oscillator, including a first comparator, a second comparator, an SR latch, and a capacitor control module. Input ends of the two comparators are coupled with the capacitor control module and an external reference threshold voltage, and two output ends are coupled with the input ends of the SR latch; output ends of the SR latch are coupled with input ends of the capacitor control module; According to the external reference threshold voltage, a first comparison signal generated by the first comparator and a second comparison signal generated by the second comparator are inputted into the SR latch to generate a control signal. According to a bias current of the external bias current source and the control signal outputted by the SR latch, periodic charging and discharging of a first capacitor and a second capacitor are controlled to generate oscillating signals.Type: ApplicationFiled: January 14, 2019Publication date: March 19, 2020Applicant: AmpliPHY Technologies LimitedInventors: Hehong ZOU, Yichao HE, Qingping LI
-
Publication number: 20200089265Abstract: This invention provides a multi-bit digitally controlled accurate current source circuit including a reference current detection unit, a voltage buffer unit, a digital logic control unit, a switch array unit, and a current source array unit. The reference current detection unit generates a first bias voltage according to a reference current; the voltage buffer unit receives the first bias voltage, and generate a buffer voltage accordingly; the digital logic control unit receives the buffer voltage, and generate a digital control signal accordingly; the switch array unit receives the digital control signal, and generate on-off signals accordingly; and the current source array unit receives and responds to the on-off signals so as to control turn-on and turn-off of the current sources in the current source array unit. In this invention, by adding only one voltage buffer, a cascode current source if formed, and an area saving accurate current source is realized.Type: ApplicationFiled: January 14, 2019Publication date: March 19, 2020Applicant: AmpliPHY Technologies LimitedInventors: Tianlin CAO, Yichao He, Jie Lou, Qingping Li, Zhuoyuan Li
-
Publication number: 20200089267Abstract: This invention provides a current self-checking regulation circuit based on voltage calibration including a bandgap reference unit, a self-calibration unit, a detection and regulation unit, current mirror units, and a current mirror control unit. The bandgap reference unit is configured to generate a voltage signal, the self-calibration unit is configured to respond to a digital signal of the detection and regulation unit and calibrate the voltage signal of the bandgap reference unit. The detection and regulation unit samples the reference current signal and a mirror current signal of the regulation group current mirror unit and generate a digital control signal according to the reference current signal. and the reference group current mirror unit responds to the digital control signal and outputs a regulated bias current signal meeting needs of the laser driver.Type: ApplicationFiled: January 14, 2019Publication date: March 19, 2020Applicant: AmpliPHY Technologies LimitedInventors: Chih-yang WANG, Yichao HE
-
Publication number: 20200091678Abstract: This invention provides an accurate current mirror circuit in a low voltage headroom applied to common-anode laser drivers, including a reference current detection unit, a tail current source unit, and a control unit. The reference current detection unit generates a bias voltage and a reference voltage according to a reference current from the reference current source; the tail current source unit receives the bias voltage and generate a mirror current accordingly; the control unit receives the reference voltage and an output voltage corresponding to the mirror current and carry out a feedback regulation to the bias voltage accordingly. In this invention, the reference voltage and the output voltage are locked at same level, and then the bias voltage is mirrored to generate the mirror current outputted to the laser, thus avoiding the problem of inaccurate current output caused by the offset of the control unit in the low voltage headroom.Type: ApplicationFiled: January 14, 2019Publication date: March 19, 2020Applicant: AmpliPHY Technologies LimitedInventors: Hehong ZOU, Tianlin CAO, Jie LOU, Zhuoyuan LI