Silicon photonics modulator driver
First Claim
1. A conversion arrangement for converting a differential input signal to a complementary metal-oxide-semiconductor (CMOS) output signal, the conversion arrangement comprising:
- a differential amplifier configured to produce a first amplified signal based on the differential input signal, wherein the differential amplifier includes;
a first pair of MOS devices having a first conductivity type, each MOS device of the first pair configured to receive one differential input of the differential input signal; and
a second pair of MOS devices having a second conductivity type, each MOS device of the second pair operating as a current source load for a respective MOS device of the first pair;
at least two transimpedance amplifiers (TIAs) coupled with respective differential outputs of the differential amplifier and configured to produce a second amplified signal based on the first amplified signal, wherein respective bias voltages for the at least two TIAs are based on the first amplified signal; and
a common-mode feedback arrangement coupled with outputs of the at least two TIAs and configured to control the first amplified signal based on the second amplified signal, wherein the common-mode feedback arrangement is coupled with a gate of each MOS device of the second pair in the differential amplifier to control the first amplified signal, andwherein the CMOS output signal is based on the second amplified signal.
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Accused Products
Abstract
Embodiments generally relate to a conversion arrangement, a driver arrangement, and a method of producing a complementary complementary metal-oxide-semiconductor (CMOS) output signal for driving a modulator device. The conversion arrangement includes a differential amplifier configured to produce a first amplified signal based on the differential input signal, and at least two transimpedance amplifiers (TIAs) coupled with respective outputs of the differential amplifier and configured to produce a second amplified signal based on the first amplified signal. Respective bias voltages for the TIAs are based on the first amplified signal. The conversion arrangement further includes a common-mode feedback arrangement coupled with outputs of the TIAs and configured to control the first amplified signal based on the second amplified signal, thereby controlling the bias voltages, wherein the complementary CMOS output signal is based on the second amplified signal.
7 Citations
19 Claims
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1. A conversion arrangement for converting a differential input signal to a complementary metal-oxide-semiconductor (CMOS) output signal, the conversion arrangement comprising:
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a differential amplifier configured to produce a first amplified signal based on the differential input signal, wherein the differential amplifier includes; a first pair of MOS devices having a first conductivity type, each MOS device of the first pair configured to receive one differential input of the differential input signal; and a second pair of MOS devices having a second conductivity type, each MOS device of the second pair operating as a current source load for a respective MOS device of the first pair; at least two transimpedance amplifiers (TIAs) coupled with respective differential outputs of the differential amplifier and configured to produce a second amplified signal based on the first amplified signal, wherein respective bias voltages for the at least two TIAs are based on the first amplified signal; and a common-mode feedback arrangement coupled with outputs of the at least two TIAs and configured to control the first amplified signal based on the second amplified signal, wherein the common-mode feedback arrangement is coupled with a gate of each MOS device of the second pair in the differential amplifier to control the first amplified signal, and wherein the CMOS output signal is based on the second amplified signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A driver arrangement configured to receive a differential input signal and to produce a complementary metal-oxide-semiconductor (CMOS) output signal for driving a modulator device, the driver arrangement comprising:
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a conversion arrangement configured to; amplify, at a differential amplification stage, the differential input signal to produce a first amplified signal, wherein the differential amplification stage includes; a first pair of MOS devices having a first conductivity type, each MOS device of the first pair configured to receive one differential input of the differential input signal; and a second pair of MOS devices having a second conductivity type, each MOS device of the second pair operating as a current source load for a respective MOS device of the first pair; amplify, using at least two transimpedance amplifiers (TIAs) coupled with respective differential outputs of the differential amplification stage, the first amplified signal to produce a second amplified signal, wherein respective bias voltages for the at least two TIAs are based on the first amplified signal; and produce, based on the second amplified signal and using a feedback arrangement coupled with the differential amplification stage, a control signal for the differential amplification stage, wherein the feedback arrangement is coupled with a gate of each MOS device of the second pair in the differential amplification stage to control the first amplified signal, and wherein application of the control signal to the differential amplification stage operates to control the bias voltages for the TIAs. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of producing a complementary metal-oxide-semiconductor (CMOS) output signal for driving a modulator device, the method comprising:
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receiving a differential input signal; amplifying, using a differential amplifier, the differential input signal to produce a first amplified signal, wherein the differential amplifier includes; a first pair of MOS devices having a first conductivity type, each MOS device of the first pair configured to receive one differential input of the differential input signal; and a second pair of MOS devices having a second conductivity type, each MOS device of the second pair operating as a current source load for a respective MOS device of the first pair; amplifying, using transimpedance amplifiers (TIAs) coupled with respective outputs of the differential amplifier, the first amplified signal to produce a second amplified signal, wherein respective bias voltages for the TIAs are based on the first amplified signal; producing, based on the second amplified signal and using a feedback arrangement coupled with the differential amplifier, a control signal for the differential amplifier, wherein the feedback arrangement is coupled with a gate of each MOS device of the second pair in the differential amplifier to control the first amplified signal; and applying the control signal to the differential amplifier, thereby controlling the bias voltages for the TIAs, wherein the CMOS output signal is based on the second amplified signal. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification