Two-way error amplifier
An error amplifier, dual-channel technology, applied in the direction of differential amplifiers, DC-coupled DC amplifiers, etc., can solve the problems that the DC bias point cannot be set, cannot be guaranteed, and the dual-channel error amplifier cannot provide stable voltage.
Active Publication Date: 2014-06-04
HANGZHOU SILAN MICROELECTRONICS
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Problems solved by technology
The drain-source current of M52 in the current error amplifier, that is, the output current of the current error amplifier is equal to the output current I11 of the voltage error amplifier, but the connection mode between M52 and M42 and the voltage error amplifier makes the gate voltage of M52 uncertain and cannot be set Set the correct DC bias point, so M52 cannot guarantee to work in the saturation area all the time, so in the constant current mode, the output port OUT of the dual error amplifier cannot provide a stable voltage
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[0067] In order to make the content of the present invention clearer and easier to understand, the content of the present invention will be further described below in conjunction with the accompanying drawings. Of course, the present invention is not limited to this specific embodiment, and general replacements known to those skilled in the art are also covered within the protection scope of the present invention.
[0068] Secondly, the present invention is described in detail by means of schematic diagrams. When describing the examples of the present invention in detail, for the convenience of explanation, the schematic diagrams are not partially enlarged according to the general scale, which should not be used as a limitation of the present invention.
[0069] image 3 It is a block diagram of the dual-channel error amplifier in an embodiment of the present invention. Such as image 3 As shown, the dual error amplifier includes a first error amplifier 21 and a second error...
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The invention discloses a two-way error amplifier which comprises a first error amplifier and a second error amplifier, wherein when the voltage value of the positive input end of the second error amplifier is smaller than that of the negative input end of the second error amplifier and the voltage value of the positive input end of the first error amplifier is equal to that of the negative input end of the first error amplifier, the output current of the second error amplifier is constantly equal to that of the first error amplifier working in a saturated zone; and when the voltage value of the positive input end of the second error amplifier is equal to that of the negative input end of the second error amplifier and the voltage value of the positive input end of the first error amplifier is less than that of the negative input end of the first error amplifier, the output current of the first error amplifier is constantly equal to that of the second error amplifier working in the saturated zone.
Description
technical field [0001] The present invention relates to error amplifier technology, more precisely, relates to a structure of a dual-way error amplifier. Background technique [0002] Some circuits need to realize constant voltage and constant current functions at the same time, usually need to use dual error amplifier, such as figure 1 As shown, it is a module schematic diagram of a dual-way error amplifier in the prior art, the current error amplifier 11 includes a positive input terminal IN+, a negative input terminal IN- and an output terminal; the voltage error amplifier 12 includes a positive To the input terminal VN+, the negative input terminal VN- and the output terminal, the output terminal of the voltage error amplifier 12 is connected to the output terminal of the current error amplifier 11 and connected to the output terminal OUT. [0003] figure 1 The dual error amplifier shown has one and only two operating states: [0004] The first is the constant voltage...
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IPC IPC(8): H03F3/45
Inventor 吴建辉詹桦吴建兴
Owner HANGZHOU SILAN MICROELECTRONICS