significane of output and input impedance

In CMOS we need high i/p impedance so that no current flows through the gate. But what is the significance of low output impedance and how does it involves noise. Is it also something to do with fanout?

Asked By: virtuevivek
On: Dec 17, 2005 3:41:26 PM

Comments(4)

Low Output impedance - so that it can provide more current to drive gates of many other transistors. (For a given Voltage at output lesser resistance means more current). Thus lesser output resistance increases its fanout. High input impedance - to draw no/less current from the preceding gate which drives it. This will improve the fanout of the preceding gate which drives this gate.

Comment By: rlnmanirln
On: Jan 19, 2010 9:29:17 AM

new topic on vlsi ppt

Comment By: hasinik
On: Dec 25, 2009 8:16:08 AM

Design Problem pertaining to interfacing of 8085 and 8255 microprocessor. use only a single decoder in place of two decoders(one for chip select and the other for read/write bar.

Comment By: netra123
On: Mar 28, 2009 9:31:58 AM

Output impedance if high will damp the output drive i.e more voltage drop will be there in the op resistor so not advisable. in case of current amplifier we need high res. so that more current flows into the load. vivek go through the basic conf. of voltage and current amplifiers .

Comment By: venkateshr
On: Jan 11, 2006 5:19:40 AM

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