An "'envelope detector "'is an electronic circuit that takes a high-frequency signal as input and provides an output which is the rectifies the incoming signal, allowing current flow only when the positive input terminal is at a higher potential than the negative input terminal.
42.
This allows for a floating gyrator, but the inductance simulated across the input terminals of the gyrator pair must be cut in half for each gyrator to ensure that the desired inductance is met ( the impedance of inductors in series adds together ).
43.
Note that " V i " is the nominal voltage that would be delivered by the generator if it were terminated in its characteristic impedance ( i . e . " R 1 " ), not the actual voltage appearing at the input terminals of the filter.
44.
The comparator is a very high gain amplifier with its plus input terminal connected for reference to 0.0 V . Whenever the negative input terminal is taken negative with respect the positive terminal of the amplifier the output saturates positive and conversely negative saturation for positive input.
45.
The comparator is a very high gain amplifier with its plus input terminal connected for reference to 0.0 V . Whenever the negative input terminal is taken negative with respect the positive terminal of the amplifier the output saturates positive and conversely negative saturation for positive input.
46.
This is accomplished by using separate " sense leads, " connected to the load's input terminals, to measure the output voltage . ( Because the sensing function draws only a very small amount of current, there is practically no additional voltage drop due to the sense leads themselves .)
47.
However, the results do depend upon the main amplifier having a representation as a two-port that is, the results depend on the " same " current entering and leaving the input terminals, and likewise, the same current that leaves one output terminal must enter the other output terminal.
48.
There are " i " input calls entering via the same ingress switch as the free input terminal to be connected, and there are " j " calls leaving the Clos network ( output calls ) via the same egress switch as the free output terminal to be connected.
49.
Together they receive instructions to obtain a circuit diagram of one of Colossus'input terminals and a sample of the information fed into it, along with instructions to proceed to two locations one in St . John's, Newfoundland, the other in New York's Central Park to receive further transmissions.
