The LM324 family of devices is an inexpensive quad op amp with a true differential input. They have some significant advantages over standard op amps for single-supply applications. The four amplifiers can operate at power supplies as low as 3.0 volts or as high as 32 volts, with quiescent current being one-fifth the quiescent current of the MC1741. The common-mode input range includes a negative supply, eliminating the need for external biasing components in many applications. Each set of operational amplifiers can be represented by the symbol shown in Figure 1. It has 5 pinouts, where "+" and "-" are the two signal inputs, and "V+" and "V-" are positive and negative supplies. End, "Vo" is the output. In the two signal input terminals, Vi-(-) is the inverting input terminal, indicating that the signal of the op amp output terminal Vo is opposite to the input terminal; Vi+(+) is the non-inverting input terminal, indicating the signal of the op amp output terminal Vo. Same phase as this input.
With the rapid development of mobile communication equipment, in the mobile communications network engineering design, according to the requirements of the network coverage, traffic distribution, anti-interference requirements and network service quality and so on the actual situation to select the base station antenna, the communication base station antenna is currently on the market work the characteristics of the narrow frequency band, such as directional literal outdoor antenna, The operating frequency band is 860~960Mhz. Those multi-band antennas have the characteristics of high manufacturing cost and complex structure. With the development of communication technology, especially the popularization of 3G communication technology, such antennas are difficult to meet the market requirements. Therefore, to avoid the above problems, it is necessary to provide a base station antenna that is simple to manufacture, low cost, and reliable in performance to overcome the alleged defects in prior art.
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