Dear friends,
I am having trouble understanding example 5.12 pg 435 (5th edition) in the Microelectronic Circuits book of Sedra and Smith. This same circuit appears in previous editions as well. It shows two transistors, one npn and one pnp. They are connected at the base which is biased through a +5V supply and a 10k resistor. The collector of the npn (which is on the top part of the circuit) is connected directly to +5V, while the collector of the pnp is connected directly to -5V. Their emitters are connected together to ground through a 1k resistor.
The auhtors say that "by examining the circuit we conclude that the two transistors cannot be simultaneously conducting." Can anyone explain to me why this is so? Thank you very much in advance.
Elias
I am having trouble understanding example 5.12 pg 435 (5th edition) in the Microelectronic Circuits book of Sedra and Smith. This same circuit appears in previous editions as well. It shows two transistors, one npn and one pnp. They are connected at the base which is biased through a +5V supply and a 10k resistor. The collector of the npn (which is on the top part of the circuit) is connected directly to +5V, while the collector of the pnp is connected directly to -5V. Their emitters are connected together to ground through a 1k resistor.
The auhtors say that "by examining the circuit we conclude that the two transistors cannot be simultaneously conducting." Can anyone explain to me why this is so? Thank you very much in advance.
Elias