摘要:
The present invention is directed to electrical circuits and techniques thereof. More specifically, embodiments of the present invention provide a differential amplifier that has a differential amplifier section, a current source, and a feedback section. The differential amplifier section comprises NMOS transistors that receives two voltage inputs and generate a differential output. The current source provides a long tail for the differential amplifier section. The feedback section generates a feedback voltage based on a reference bias voltage. The feedback voltage is used by an amplifier to control the current source and to keep the biasing and gain of the differential amplifier substantially constant. There are other embodiments as well.
摘要:
A current amplifier and a transmitter using the same. The current amplifier has a first and second transistor and a voltage level shifting unit. The first transistor has a gate receiving an input current and a drain receiving a driving current. The voltage level shifting unit providing a voltage shift is coupled between the drain of the first transistor and the gate of the second transistor. An output current is generated at the drain of the second transistor.
摘要:
An amplifier includes a first input branch and a second input branch that form a differential input stage and a current mirror connected to the differential input. The current mirror is governed as a function of a common mode feedback signal applied to a control node of the current mirror. A second, amplification, stage includes a branch flowing through which is a current, which is a function of the current that flows in the first input branch, and is in turn connected to a first output branch. A capacitive element is coupled between the control node and the second stage. The circuit is symmetrical with respect to the input stage.
摘要:
A radio frequency (RF) MEMS resonator is embedded in an active positive feedback loop to form a tunable RF channel-selecting radio transceiver employing a super-regenerative reception scheme. This transceiver harnesses the exceptionally high Q (around 100,000) and voltage-controlled frequency tuning of a resonator structure to enable selection of any one of among twenty 1 kHz wide RF channels over an 80 kHz range, while rejecting adjacent channels and consuming
摘要:
A Low-Voltage Differential Signaling (differential signaling) driver circuit (10) comprising enable circuitry for enabling and disabling the differential signaling driver circuit (10) in accordance with an control signal is described. The differential signaling driver circuit (10) comprises: a differential output (12, 13) connected or connectable to a differential signaling receiver circuit via a differential transmission line; current control circuitry (14) for driving a signal current through the differential output (12, 13) in accordance with a driver signal; feedback circuitry (16) for driving the current control circuitry (14) to counteract a difference between a common mode voltage of the differential output (12, 13) and a reference voltage from a reference voltage provider; and the enable circuitry (18). The feedback circuitry (16) comprises a common mode node (20) for providing the common mode voltage (Vcm), a reference input (22) connected or connectable to the reference voltage provider, and a feedback input (24). The enable circuitry (18) is arranged to connect the feedback input (24) to the common mode node (20) when the differential signaling driver circuit (10) is in an enabled state and to the reference voltage provider when the differential signaling driver circuit (10) is in a disabled state. A method of enabling (5.1) and disabling (5.2) a Low-Voltage Differential Signaling (differential signaling) driver circuit (10) is also proposed.
摘要:
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.
摘要:
The differential signals at the outputs of a differential amplifier quickly change in response to common mode changes in the output differential signals. The amplified input signals amplified by the differential amplifier quickly change in response to common mode changes in the differential signals input into the differential amplifier. A bias voltage input to the differential amplifier is isolated to remove low-frequency components from the bias voltage.
摘要:
A multi-terminal output with a common mode connection includes an output having a first terminal and a second terminal and having a common mode connection between the first terminal and the second terminal. A bulk connection of a transistor is coupled to the common mode connection. A first set of control signals and a second set of control signals are generated. Each of the first set of control signals has a first rail voltage level associated with a first power domain. The second set of control signals is generated from the first set of control signals. Each of the second set of control signals has a second rail voltage level that is associated with a second power domain. The second power domain is associated with a common mode voltage of outputs of an output driver.
摘要:
A preamplifier includes a differential pair of transistors receiving a bias current having a differential input and a differential output, a first resistor coupled to a first differential output node, a first transistor having a current path coupled between the first resistor and a power supply, a second resistor coupled to the first differential output node, a second transistor having a current path coupled between the second resistor and the power supply, a third resistor coupled to a second differential output node, a third transistor having a current path coupled between the third resistor and the power supply, a fourth resistor coupled to the second differential output node, and a fourth transistor having a current path coupled between the fourth resistor and the power supply, wherein a source of the second and third transistors are coupled together.
摘要:
An RF-demodulator includes an RF-input, a demodulator output, a mixing and amplification stage coupled between the RF-input and the demodulator output, and a calibration circuitry. The calibration circuitry is configured to apply a calibration input signal at the RF-input and sense a resulting calibration output signal at the demodulator output to derive a gain of the mixing and amplification stage based on the relationship between the calibration output signal and the calibration input signal.