Differential amplifier capable of compensating input offset voltage and compensating method
A differential amplifier, offset voltage technology, applied in the field of electronics, can solve the problems of complex control circuits, increasing circuit complexity and chip area, etc.
Inactive Publication Date: 2011-07-27
覃超
View PDF9 Cites 37 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the method and device for compensating the DC offset voltage disclosed in this patent have two disadvantages: first, the method makes the first NMOS transistor M1 or the second NMOS transistor M2 have an asymmetric structure, so when the temperature changes, there will be New offset and temperature drift phenomenon; Second, more complex control circuits are required, which increases circuit complexity and chip area
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0036]The detailed description of the present invention directly or indirectly simulates the operation of the technical solution of the present invention mainly through programs, steps, logic blocks, processes or other symbolic descriptions. In the ensuing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. Rather, the invention may be practiced without these specific details. These descriptions and representations herein are used by those skilled in the art to effectively convey the substance of their work to others skilled in the art. In other words, for the purpose of avoiding obscuring the present invention, well-known methods, procedures, components and circuits have not been described in detail since they are readily understood.
[0037] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementat...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a differential amplifier capable of compensating input offset voltage, which comprises differential input geminate transistors including a first transistor and a second transistor, wherein a source electrode of the first transistor is connected with a current source through a first polarity fuse switch, a source electrode of the second transistor is connected with the current source through a second polarity fuse switch, a plurality of trimmer resistors are serially connected between the source electrode of the first transistor and the source electrode of the second transistor, and each trimmer resistor is connected with a resistance fuse switch in parallel. Simultaneously, the invention also provides an input offset voltage compensating method. The differential amplifier capable of compensating input offset voltage and the compensating method adopt a resistance trimming network to compensate the input offset voltage, and maintain the symmetrical appearance of the differential geminate transistors; and simultaneously, a drift compensation mechanism is also provided.
Description
【Technical field】 [0001] The invention relates to the electronic field, in particular to a circuit and a method for compensating input offset voltage in a differential amplifier by introducing a trimming voltage through a trimming resistor. 【Background technique】 [0002] A differential amplifier, also known as a differential amplifier, is a circuit that amplifies the difference between two input voltages. Differential amplifiers are often used for DC amplification. It can be balanced input and output, or single-ended (unbalanced) input and output. It is often used to achieve mutual conversion between balanced and unbalanced circuits. It is a basic unit of various integrated circuits. . [0003] Please refer to figure 1 , which shows a schematic structural diagram of a typical differential amplifier 100 in the prior art. The differential amplifier 100 includes a first branch formed by a first NMOS transistor M1 and a third NMOS transistor M3, and a second branch formed by...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H03F3/45H03F1/30
Inventor 覃超
Owner 覃超