14results about "Control circuit for distortion reduction" patented technology

A current sense amplifier measures a voltage drop in a drive transistor LS to measure the current flowing through the drive transistor LS. The current sense amplifier includes a preamplifier pre-amp, to which a voltage across the drive transistor LS is inputted, and which obtains a positive output and a negative output corresponding to a voltage difference of the inputted voltage across the drive transistor; and a switch sw, which connects the input end of a common mode voltage vcm and the negative output, the common mode voltage vcm serving as the operation reference of the preamplifier pre-amp. A change of the positive output caused by turning on / off the switch sw can be detected.

A digital pre-distortion circuit and technique for a signal being amplified. Digital pre-distortion is performed using a model-based pre-distortion function. Pre-distortion is further corrected using a data-driven pre-distortion function. The model-based pre-distortion function and the data-driven pre-distortion function are trained using training data including a digital loopback signal generated by sampling a loopback signal of an amplifier, the digital pre-distorted signal input to the amplifier for a time period, and an intermediate signal output from the model-based pre-distortion function driven by the digital loopback signal or an output of the data-driven pre-distortion function. Parameters may be continually updated in order to account for changes in characteristics of the amplifier.

[Problem to be solved] The disclosure is to deal with a wide range of DC voltages in the input.[Solution] In a current sense amplifier 100, an upper side voltage and a lower side voltage of a current detection resistor 2 are input thereto, and an output corresponding to a difference between the upper side voltage and the lower side voltage is obtained. A common mode voltage suppressor 12 includes: voltage division resistors R6a and R6b, the upper side voltage and the lower side voltage being supplied to the two ends thereof, and a division voltage being obtained; a first transistor M1, the upper side voltage being input to one end thereof, and the other end thereof being connected to a predetermined power supply; and a second transistor M2, the lower side voltage being input to one end thereof, and the other end thereof being connected to a predetermined power supply. A control end of the first transistor M1 and a control end of the second transistor M2 are commonly connected and the division voltage is input thereto.

Easily set the offset voltage of the post-amplifier. [Solution] The system includes a preamplifier 10 that obtains a preamplifier positive output vc and a preamplifier negative output vb according to the difference between the upper and lower voltages of a current sensing resistor R0, and a postamplifier 12 that has a positive input terminal to which the preamplifier positive output is input and a negative input terminal to which the preamplifier negative output is input, and obtains a postamplifier output vout. The postamplifier 12 is an input path to the positive input terminal. to The positive input resistor to be placed R4b And the negative input resistor where the input path to the negative input terminal is located. R4a And, post-amp output end The system includes a feedback resistor R5 positioned in the return path from the negative input terminal to the negative input terminal, and a resistor network connecting the positive input terminal to a reference power supply and ground, which supplies an offset voltage obtained by resistance division of the voltage of the reference power supply to the positive input terminal, and whose combined resistance value corresponds to the resistance value of the feedback resistor.

A circuit includes an analog-to-digital converter (ADC). The circuit also includes an analog front end (AFE, 310) having an AFE input and an AFE output. The AFE output is coupled to an input of the ADC. The AFE includes a programmable gain amplifier (PGA, 115) having a first PGA input and a second PGA input. The PGA (115) includes a first operational amplifier (OP AMP, OP1) having first and second OP AMP inputs. The AFE (310) also includes a programmable resistance circuit (320) having a first programmable resistance circuit input and first and second programmable resistance circuit outputs. The first programmable resistance circuit input is coupled to the first and second PGA inputs. The programmable resistance circuit (320) includes a resistor network having first and second balancing resistances. The first balancing resistance is coupled to the first and second OP AMP inputs, and the second balancing resistance is coupled to the first and second OP AMP inputs.

The present invention addresses the problem of easily setting the input voltage of a preamplifier. The present invention includes a preamplifier (10) that obtains a preamplifier positive output (vc) and a preamplifier negative output (vb) corresponding to a difference between an upper-side voltage and a lower-side voltage of a current detection resistor (R0). The preamplifier (10) has a first operational amplifier (opa1), the upper voltage is input to the negative input end of the first operational amplifier, the lower voltage is input to the positive input end of the first operational amplifier, and the first operational amplifier (opa1) obtains a first operational amplifier positive output and a first operational amplifier negative output on the basis of the difference between the upper voltage and the lower voltage. The connection point of the negative input resistor of the first operational amplifier and the negative input end of the first operational amplifier is connected to a constant voltage source through a first input adjusting resistor, and the connection point of the positive input resistor of the first operational amplifier and the positive input end of the first operational amplifier is connected to the constant voltage source through a second input adjusting resistor.

A preamplifier obtains a preamplifier positive output and a preamplifier negative output; and a post-amplifier has a positive input end to which the preamplifier positive output is input and a negative input end to which the preamplifier negative output is input, and obtains a post-amplifier output. The post-amplifier includes: a positive side input resistor disposed in an input path to the positive input end; a negative side input resistor disposed in an input path to the negative input end; a feedback resistor disposed in a feedback path from a post-amplifier output end to the negative input end; and a resistor network in which an offset voltage obtained by performing resistance division to the voltage of the reference power supply is supplied to the positive input end, and a combined resistance value corresponds to the resistance value of the feedback resistor.

The present invention is to improve temperature dependence in a current sense amplifier. The current sense amplifier of the present invention measures a voltage drop in a drive transistor (LS) to measure a current flowing in the drive transistor (LS). The current sense amplifier includes a pre-amp to which a voltage across the drive transistor (LS) is inputted, to obtain a positive output and a negative output corresponding to a voltage difference of the inputted voltage across, and a switch (sw) connecting an input terminal of a common mode voltage (vcm) which is an operation reference of the pre-amp to the negative output. A change in the positive output caused by turning on / off the switch (sw) can be detected.

The present invention addresses the problem of easily setting an offset voltage of a post-amplifier. The present invention is provided with: a preamplifier (10) that obtains a preamplifier positive output (vc) and a preamplifier negative output (vb) corresponding to the difference between the upper voltage and the lower voltage of a current detection resistor (R0); and a post-amplifier (12) which has a positive input terminal to which the positive output of the pre-amplifier is input and a negative input terminal to which the negative output of the pre-amplifier is input, and which obtains a post-amplifier output (vout). A post-amplifier (12) includes: a positive-side input resistor (R4b) disposed on an input path leading to a positive input terminal; a negative-side input resistor (R4a) disposed on an input path leading to the negative input terminal; the feedback resistor (R5) is configured on a feedback path from the output end of the post amplifier to the negative input end; and a resistance network that connects the positive input terminal to the reference power supply and the ground, supplies an offset voltage to the positive input terminal, said offset voltage being obtained by dividing the voltage of the reference power supply by resistance, and has a combined resistance value corresponding to the resistance value of the feedback resistor.

The application is suitable for the field of amplifier technology, and provides a power amplifier cooperative linearization method and system, the method comprising: obtaining an error signal of a power amplifier, and separating the error signal into slow-varying and fast-varying error components; performing predictive feedforward control based on the fast-varying component to suppress the short-time electrical memory effect of the power amplifier; and performing decoupling compensation control based on the slow-varying component to compensate for the long-time thermal memory effect of the power amplifier. The decoupling compensation control orthogonally decomposes the slow-varying error component into in-phase and quadrature components to independently compensate for amplitude and phase distortion. Through fast-slow loop cooperation, predictive intervention and decoupling compensation, the application can quickly respond to transient distortion and accurately compensate for long-term drift, thereby improving the dynamic linearity, compensation accuracy and stability of the power amplifier.

The invention is suitable for the technical field of amplifiers, and provides a cooperative linearization method and system for a power amplifier, and the method comprises the steps: obtaining an error signal of the power amplifier, and separating the error signal into a slowly-changing error component and a rapidly-changing error component; performing predictive feed-forward control based on the fast-varying component to suppress a short-time electrical memory effect of the power amplifier; decoupling compensation control is performed based on the slowly varying component to compensate for the long-term thermal memory effect of the power amplifier. The decoupling compensation control orthogonally decomposes the slow-varying error component into in-phase and quadrature components to independently compensate for amplitude and phase distortions. Through fast and slow loop cooperation, predictive intervention and decoupling compensation, transient distortion can be quickly responded, long-term drift can be accurately compensated, and the dynamic linearity, compensation precision and stability of the power amplifier are improved.

A preamplifier obtains a preamplifier positive output and a preamplifier negative output corresponding to a difference between an upper voltage and a lower voltage of a current detection resistor. The preamplifier includes an operational amplifier, in which the upper voltage is input to an operational amplifier negative input end and the lower voltage is input to an operational amplifier positive input end, and which obtains an operational amplifier positive output and an operational amplifier negative output based on a difference between them. The connection point between an operational amplifier negative input resistor and the negative input end of the operational amplifier is connected to a constant voltage source via a first input adjustment resistor; and the connection point between an operational amplifier positive input resistor and the positive input end of the operational amplifier is connected to the constant voltage source via a second input adjustment resistor.

A digital pre-distortion circuit and technique for a signal being amplified. Digital pre-distortion is performed using a model-based pre-distortion function. Pre-distortion is further corrected using a data-driven pre-distortion function. The model-based pre-distortion function and the data-driven pre-distortion function are trained using training data including a digital loopback signal generated by sampling a loopback signal of an amplifier, the digital pre-distorted signal input to the amplifier for a time period, and an intermediate signal output from the model-based pre-distortion function driven by the digital loopback signal or an output of the data-driven pre-distortion function. Parameters may be continually updated in order to account for changes in characteristics of the amplifier.

Easily set the input voltage of the preamplifier. [Solution] The preamplifier 10 includes a preamplifier positive output vc and a preamplifier negative output vb corresponding to the difference between the upper and lower voltages of a current sensing resistor R0. The preamplifier 10 has a first operational amplifier opa1 to which the upper voltage is input to the negative input terminal of the first operational amplifier and the lower voltage is input to the positive input terminal of the first operational amplifier, and which obtains a positive output and a negative output of the first operational amplifier based on the difference between these. The connection point between the negative input resistor of the first operational amplifier and the negative input terminal of the first operational amplifier is connected to a constant voltage source via a first input adjustment resistor, and the connection point between the positive input resistor of the first operational amplifier and the positive input terminal of the first operational amplifier is connected via a second input adjustment resistor. The aforementioned It is connected to a constant voltage source.