PDOs are supposed ideals, in linear mode (V + = V-).
First, here is the block diagram of the operating principle (click to enlarge):
To simplify the expressions of voltages, it is seen that the two input voltages V1 and V2 each pass through a logarithmic amplifier, which gives us two voltages natural logarithm to the input of asumming inverter. The output thereof is a sum of logarithm, ie the logarithm of the product of the input voltages. This is sent in an exponential amplifier, which gives us the opposite occurs: -V1.V2output. Just to finish going through an inverting amplifier gain -1 for the product: Vs = V1.V2
A basic electronic realisation is (knowing that now many integrated circuits that perform much better propagation):
All PDOs operate in linear mode, it is only assembling a precise order of basic circuits. This mounting comes easily to its own physical limits, the output PDO can not exceed exceed the range + 15V / -15V. The operation * 2 V 3 V = 6 V is possible, but not 8 V 10 V *!
Multiplier circuit | Multiplier voltages
First, here is the block diagram of the operating principle (click to enlarge):
To simplify the expressions of voltages, it is seen that the two input voltages V1 and V2 each pass through a logarithmic amplifier, which gives us two voltages natural logarithm to the input of asumming inverter. The output thereof is a sum of logarithm, ie the logarithm of the product of the input voltages. This is sent in an exponential amplifier, which gives us the opposite occurs: -V1.V2output. Just to finish going through an inverting amplifier gain -1 for the product: Vs = V1.V2
A basic electronic realisation is (knowing that now many integrated circuits that perform much better propagation):
All PDOs operate in linear mode, it is only assembling a precise order of basic circuits. This mounting comes easily to its own physical limits, the output PDO can not exceed exceed the range + 15V / -15V. The operation * 2 V 3 V = 6 V is possible, but not 8 V 10 V *!
Multiplier circuit | Multiplier voltages