i have a design project, which includes designing a single stage amplifier (cmos device) i have to use telescopic p mos load to design degenerated common source single stage amplifier.
what exactly is a telescopic load, i have tried googling it but all i found out was about telescopic op-amp , telescopic cascode.
Any help would be appretiated
What is telescopic Mos load
amplifiercmosmosfet
Related Solutions
Yes. The output impedance of one stage was too high relative to the imput impedance of the next stage. To fix this, take the input and output impedances of each stage into account. Generally you have each stage make the impedance lower, and have the input impedance of each stage be several times the output impedance of the stage that is feeding it.
Consider this
simulate this circuit – Schematic created using CircuitLab
That 0.1uv (100 nanoVolt) input will be amplified 200X in Q1, then attenuated 2:1 by the voltage-divider of Q2's Rout and the 4 ohm load.
Assuming zero-source impedance, so Miller Effect has no effect on bandwidth, your gain-node time-constant will be 20pF * 200 ohm or 4,000 nanoseconds, thus bandwidth will be about 40MHz. Amazing.
Assuming the dominant random-noise contributor is rbb' of Q1, at 62 ohms, the noise density of 62 ohms is exactly 1 nanoVolt/rootHertz. A bandwidth of 40MHz increases the noise by 1nanoVolt * sqrt(40,000,000) = 1nV * 6,500 = 6.5 uV RMS referred-to-input random noise. The output noise, loaded by 4 ohms, will be 100X higher at 1.3 milliVolts RMS, about 9 milliVolts 6 sigma (2 ppm).
Your mileage may vary. I used no simulator in designing this.
Best Answer
It probably refers to a non-folded cascode "telescoped" with a diffamp like this:
But you should really ask at office hours (for your class) to be certain.