This type of input stage has one potential advantage. It is that the input stage can 'source' more current than just 2I(q), which is the limitation of using a current source for a single or dual differential input pair. This can improve slew rate in many circuits.
The standard transistor input complementary differential input stage was independently developed by Jon Iverson (Electroresearch) and myself (Ampex) in the late 60's, but was not published. Daniel Meyer (Southwest Technical) was the first to publish it in the early 70's in 'The Audio Amateur'.
The FET input version was developed by me in the early 70's and first published in 'The Audio Amateur' in 1977 as part of the JC-2 schematic.
The 'diamond differential' was independently developed by Sansui in the early '80's and essentially had a single differential input stage. The same circuit can be made with fets in the complementary stage and the diodes eliminated from the circuit.
The standard transistor input complementary differential input stage was independently developed by Jon Iverson (Electroresearch) and myself (Ampex) in the late 60's, but was not published. Daniel Meyer (Southwest Technical) was the first to publish it in the early 70's in 'The Audio Amateur'.
The FET input version was developed by me in the early 70's and first published in 'The Audio Amateur' in 1977 as part of the JC-2 schematic.
The 'diamond differential' was independently developed by Sansui in the early '80's and essentially had a single differential input stage. The same circuit can be made with fets in the complementary stage and the diodes eliminated from the circuit.
33nV to 1V is down 75db in Voltage and 150db in power.
poeple
racall properties of Fourier transform !!!!!!!
1.winowed function's tranform is original tranform convolved with windowing function transform
2. Time's standard deviation*bandwith standard deviation >=1/2 (Heisenberg priciple)
If you use orcad :
edit simulation settings:
run to time: 5s or more(for adequate peak sharpness)
maximum step size: 10us or less (to prevent from aliasing)
results may be suprising...
poeple
racall properties of Fourier transform !!!!!!!
1.winowed function's tranform is original tranform convolved with windowing function transform
2. Time's standard deviation*bandwith standard deviation >=1/2 (Heisenberg priciple)
If you use orcad :
edit simulation settings:
run to time: 5s or more(for adequate peak sharpness)
maximum step size: 10us or less (to prevent from aliasing)
results may be suprising...
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