Push-pull amplifier and frequency conversion circuit
A push-pull amplifier, frequency conversion circuit technology, applied in single-ended push-pull amplifier, amplifier input/output impedance improvement, electrical components and other directions, can solve the problem of unbalanced input impedance, different input impedance of upper and lower transistors, difficult to push The problems such as the output amplifier of the frequency conversion circuit of the pull-type amplifier are avoided, and the increase of the circuit scale is avoided and the circuit structure is simple.
Inactive Publication Date: 2005-10-12
NEC CORP
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Problems solved by technology
However, a problem has been encountered in that it will be difficult to achieve a reduction in power consumption since substantially the same or greater consumption current as that of the mixer circuit is required to achieve the gain required by the differential amplifier circuit.
[0018] However, if a push-pull amplifier is used as the output amplifier of the frequency conversion circuit, a problem has been encountered in that the input impedances of the upper and lower transistors are different from each other
[0031] Although a push-pull amplifier is characterized by operation with a smaller consumption current and its possibility of higher gain than a differential amplifier circuit, it is difficult to use a push-pull amplifier as an output amplifier of a frequency conversion circuit due to its unbalanced input impedance , therefore, the push-pull amplifier is not often used as a differential amplifier circuit
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[0051] Next, the present invention will be explained with reference to the drawings.
[0052] The frequency conversion circuit of the present invention employs, as an output amplifier, a push-pull amplifier allowing low consumption current and high gain operation.
[0053] like Figure 7 As shown, the push-pull amplifier of the present invention is configured so that it includes: an upper transistor (first transistor) Q1 having a collector powered at a predetermined voltage; a lower transistor (second transistor) Q2 having a grounded emitter; and a voltage The drop circuit 4 is used to drop the potential of the collector of the upper transistor Q1 to a level lower than the power supply level; wherein the emitter of the upper transistor Q1 and the collector of the lower transistor Q2 are connected to each other.
[0054] For example, the voltage drop circuit 4 is constructed so as to have a resistor Ri interposed between the collector of the upper transistor Q1 and the power s...
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As an output amplifier of a frequency converter circuit, a push-pull amplifier that allows operating with a small consumption current and providing a high gain is used. Further, the push-pull amplifier is configured to have a voltage drop circuit to lower the collector potential of the upper transistor to the level lower than the potential of the power supply. The voltage drop circuit is configured to have, for example, a resistor inserted between the collector of the upper transistor and the power supply.
Description
technical field [0001] The invention relates to a push-pull amplifier and a frequency conversion circuit for a wireless communication system. Background technique [0002] Recently, various services using wireless communication systems such as cellular phones, wireless LAN, Bluetooth, or ITS (Intelligent Transport System) have been rapidly put into widespread use. In the field of mobile terminal equipment used in such wireless communication systems, size reduction and weight reduction are progressing along with the challenge of high functionality, and for the RF (radio frequency) part of mobile terminal equipment, there is a need for energy consumption further decrease. [0003] In the various wireless communication systems described above, a frequency conversion circuit for converting a signal frequency to another frequency is one of the essential key components. The frequency conversion circuit is used in a transmission system as converting an IF (Intermediate Frequency)...
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IPC IPC(8): H03D7/14H03F1/56H03F3/30
CPCH03D7/1425H03D7/1458H03D2200/0088H03D7/1433H03D2200/009
Inventor 百百秀彰
Owner NEC CORP