H - Electricity – 03 – D
Patent
H - Electricity
03
D
328/179, 329/2
H03D 3/00 (2006.01) G05F 3/20 (2006.01) G05F 3/26 (2006.01) H03F 3/14 (2006.01) H03F 3/343 (2006.01) H03F 3/347 (2006.01)
Patent
CA 1081331
ABSTRACT OF THE DISCLOSURE A current mirror circuit comprised of three tran- sistor devices, each transistor device including an input terminal and first and second output terminals. Two of the devices have their input terminals connected together and one output terminal of each device is connected to a respective current output terminal. The other output terminal of each device is adapted to be supplied with an operating voltage. Each of the first and second transistor devices is formed of at least a pair of transistors connected in Darlington-type configuration. In one embodiment, these Darlington-connected transistors are of complementary types. The third transistor device has its input terminal coupled to one of the current output terminals and one of its output terminals coupled to the common-connected input terminals of the first and second transistor devices. The remaining output terminal of the third transistor device is coupled to a reference potential. The third transistor device also is formed of at least a pair of transistors connected in Darlington-type configuration. In one embodiment, a current feedback resistor is connected to one output terminal of each of the first and second tran- sistor devices. In another embodiment, each of the first and second transistor devices includes one transistor whose base is supplied with current by another transistor, this base being coupled to the current output terminal by a bias resistor. In one application, a fourth transistor device similar to the first and second transistor devices is pro- vided. The first transistor device has a current flowing therethrough which is proportional to the main channel signal of a stereo signal, and the second and fourth transistor devices supply currents to a sub-channel demodulator, thereby summing the demodulated sub-channel signal with currents which are proportional to the main channel signal, thereby deriving respective left and right audio channel signals. ii
285096
Nakazawa Hiroshi
Ohsawa Mitsuo
Yamagishi Hiroshi
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