7results about "Computing operations for logarithmic/exponential functions" patented technology

Aspects of the subject disclosure may include, for example, first and second operational amplifiers; and a differential pair of NPN transistors in a feedback path of the TLA configured to convert an input current signal into an output voltage signal, where a first emitter of a first NPN transistor of the pair of NPN transistors is connected to an inverting input of the first operational amplifier, and where a second emitter of a second NPN transistor of the pair of NPN transistors is connected to a non-inverting input of the second operational amplifier. Other embodiments are disclosed.

The embodiment of the invention discloses a wide-range pre-amplification circuit with a temperature compensation function and photoelectric detection equipment. The wide-range pre-amplification circuit comprises a cross-group amplification module, a filtering module and a logarithmic amplification module which are connected in sequence; for a weak light current signal in a large dynamic range, a transimpedance amplification module is designed by using an operational amplifier to carry out I / V conversion circuit, so that signal distortion caused by parasitic capacitance and gain resistance of a photoelectric conversion device is avoided; a logarithmic amplification module and a temperature compensation module designed by using a cut-off and amplification region of a triode are used for performing piecewise linear amplification on a voltage signal output by a transimpedance amplification module, high gain is used for amplifying when a small signal is input, and low gain is used for amplifying when a large signal is input so as to meet the input range of a high-precision ADC; the problem of high-precision measurement of wide-range weak signals is solved, and the temperature stability of the double-slope logarithmic amplification circuit is improved by utilizing the temperature compensation module.

The disclosure relates to a current converter circuit (600) for converting a linear input current (lctrl_lin) to an exponential output current (lctrl_sum), the current converter circuit (600) comprising first and second current converters (601, 602), each of which comprises: an input current branch (6031, 6032) with an input current source (6041, 6042) connected in series with a tuning voltage circuit (6051, 6052) and a tuning resistor (6061, 6062) between a supply voltage line (607) and a common voltage line (608); and an output current branch (6091, 6092) with an output transistor (6101, 6102) having a collector connected to an output node (6111, 6112), a emitter connected to the common voltage line (608) and a base connected to the tuning voltage circuit (6051, 6052), wherein the output nodes (6111, 6112) of the first and second current converters (601, 602) are connected to a summing output node (612) of the current converter circuit (600).

A logarithmic amplifier (200) includes a logarithmic current preamplifier circuit (202) and a logarithmic amplifier circuit (204). The logarithmic current preamplifier circuit (202) includes an inverting input terminal (206A), an output terminal (206B), and a first diode (210). The first diode (210) is coupled between the inverting input terminal (206A) and the output terminal (206B) of the logarithmic current preamplifier circuit (202). The logarithmic amplifier circuit (204) includes an inverting input terminal (212A), an output terminal (212B), and a second diode (214). The inverting input terminal (212A) of the logarithmic amplifier circuit (204) is coupled to the output terminal (212B) of the logarithmic current preamplifier circuit (202). The second diode (214) is coupled between the inverting input terminal (212A) and the output terminal (212B) of the logarithmic amplifier circuit (204).

The disclosure relates to a current converter circuit. Example embodiments include a current converter circuit (600) for converting a linear input current (Ictrl_lin) to an exponential output current (Ictrl_sum), the current converter circuit (600) comprising first and second current converters (601, 602), each of which comprises: an input current branch (6031, 6032) with an input current source (6041, 6042) connected in series with a tuning voltage circuit (6051, 6052) and a tuning resistor (6061, 6062) between a supply voltage line (607) and a common voltage line (608); and an output current branch (6091, 6092) with an output transistor (6101, 6102) having a collector connected to an output node (6111, 6112), a emitter connected to the common voltage line (608) and a base connected to the tuning voltage circuit (6051, 6052), wherein the output nodes (6111, 6112) of the first and second current converters (601, 602) are connected to a summing output node (612) of the current converter circuit (600)

The utility model discloses a photoelectric detection processing system, belongs to the technical field of colloidal gold analysis equipment, and particularly relates to a photoelectric detection processing system of a colloidal gold analyzer, which comprises a detection module, an operational amplification module, an integrated logarithmic amplification module, a filtering module and a buffer isolation module, the output end of the detection module is connected with the input end of the transport amplification module, the input end of the integrated logarithmic amplification module is connected with the output end of the operational amplification module, and the input end of the filtering module is connected with the output end of the integrated logarithmic amplification module. The input end of the buffer isolation module is connected with the output end of the filtering module, and the output end of the buffer isolation module outputs signals to a controller. The noise suppression device has excellent noise suppression capability, can well amplify the signals to ensure the stability of the signals, filters the generated noise-containing signals, and improves the noise suppression efficiency. And the filtering signal can basically keep useful components of the original signal and is relatively smooth.

The utility model discloses a high-linearity wide-range low-light detection circuit and device. The high-linearity wide-range low-light detection circuit comprises a low-light detection sub-circuit, a logarithmic amplification sub-circuit and a linear amplification sub-circuit, the low-light-level detection sub-circuit converts a detected low-light-level signal into a current signal with logarithmic variation, the logarithmic amplification sub-circuit converts the current signal with logarithmic variation into a voltage signal with linear variation after current-voltage conversion and differential amplification, and the linear amplification sub-circuit adjusts the range of the voltage signal and outputs the voltage signal. And the external circuit or device obtains the optical power of the measured low-light signal according to the output voltage signal. According to the circuit, high-linearity, wide-range and high-precision detection of low light is realized.