KHz-100GHz on-chip integrated capacitor DC coupling circuit
A technology of integrating capacitors and circuits, which is applied in the field of on-chip integrated capacitor DC coupling circuits, can solve problems such as the inability to achieve broadband impedance matching, and achieve the effects of saving broadband capacitors, reducing return loss, and reducing package size
Active Publication Date: 2022-03-25
苏州芈图光电技术有限公司
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Problems solved by technology
[0006] This application provides a kHz-100GHz on-chip integrated capacitor DC coupling circuit, which can solve the problem that the impedance matching design of conventional radio frequency circuits is not suitable for the broadband impedance matching design of electric chips, and cannot achieve broadband impedance matching; The DC coupling solution with integrated capacitor can reduce package size, reduce cost and improve broadband impedance matching
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[0035] The specific implementation manners of the present application will be further described in detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present application, but not to limit the scope of the present application.
[0036] First, some terms involved in this application are introduced.
[0037] AC coupling (AC Coupling): refers to the coupling method that removes the DC component through DC blocking capacitor coupling.
[0038] DC coupling (DC Coupling): It refers to the coupling method that passes DC and AC together, rather than removing the AC component.
[0039] For example: if a 1Vpp sine wave is superimposed on a 3V DC level, if DC coupling is used, the output is a sine wave based on 3V, ±0.5V; if AC coupling is used, the output is based on 0V, ±0.5 The sine wave of V.
[0040] The conventional blocking coupling (AC coupling) structure of the broadband chip is as follows: figure 1 as shown, figu...
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The invention relates to a kHz-100GHz on-chip integrated capacitor DC coupling circuit, which belongs to the technical field of electronic circuits, and comprises an impedance matching structure, an input impedance, an input stage structure and an on-chip capacitor, the impedance matching structure comprises a matching inductor and a first matching branch of which one ends are connected with the input end, and a second matching branch of which one end is respectively connected with the other end of the matching inductor and the other end of the first matching branch; one end of the third matching branch is connected with the matching inductor; the other end of the second matching branch and the other end of the third matching branch are connected with the input impedance; the first matching branch, the second matching branch and the third matching branch are all RLC circuits; or one or both are open circuits, and other matching branches are RLC circuits; the problem that the packaging size of a chip is increased due to AC coupling can be solved; the packaging size of the chip can be reduced, the cost is reduced, the continuity of broadband impedance is improved, and the return loss S11 of the chip is reduced.
Description
【Technical field】 [0001] The application relates to a kHz-100GHz on-chip integrated capacitive DC coupling circuit, which belongs to the technical field of electronic circuits. 【Background technique】 [0002] With the rapid development of optical communication, higher requirements are put forward for high-speed electrical chips, such as higher bandwidth, higher integration, and lower power consumption. [0003] There are many similarities between optical communication circuits and conventional radio frequency circuits, but there are also essential differences: that is, the bandwidth requirements are different. Conventional radio frequency circuits are narrowband systems, while optical communication circuits are broadband systems. Whether it is an optical communication circuit or a conventional radio frequency circuit, impedance matching is a key indicator, and the effect of impedance matching directly affects the transmission quality of the signal. [0004] However, the ma...
Claims
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Login to View More IPC IPC(8): H03H7/38
CPCH03H7/38H04B10/00H03H7/1783H03H2007/386
Inventor 张智王军成向祥林
Owner 苏州芈图光电技术有限公司