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AD831APZ データシート(PDF) 7 Page - Analog Devices |
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AD831APZ データシート(HTML) 7 Page - Analog Devices |
7 / 16 page AD831 –6– AD831 –7– THEORY OF OPERATION The AD831 consists of a mixer core, a limiting amplifier, a low noise output amplifier, and a bias circuit (Figure 1). The mixer’s RF input is converted into differential currents by a highly linear, Class A voltage-to-current converter, formed by transistors Q1, Q2 and resistors R1, R2.The resulting currents drive the differential pairs Q3, Q4 and Q5, Q6.The LO input is through a high gain, low noise limiting amplifier that converts the –10 dBm LO input into a square wave.This square wave drives the differential pairs Q3, Q4 and Q5, Q6 and produces a high level output at IFP and IFN—consisting of the sum and differ- ence frequencies of the RF and LO inputs—and a series of lower level outputs caused by odd harmonics of the LO frequency mix- ing with the RF input. An on-chip network supplies the bias current to the RF and LO inputs when these are ac-coupled; this network is disabled when the AD831 is dc-coupled. When the integral output amplifier is used, pins IFN and IFP are connected directly to pins AFN and AFP; the on-chip load resistors convert the output current into a voltage that drives the output amplifier. The ratio of these load resistors to resistors R1, R2 provides nominal unity gain (0 dB) from RF-to-IF. The expression for the gain, in decibels, is GdB = Ê ËÁ ˆ ¯˜ Ê ËÁ ˆ ¯˜ Ê ËÁ ˆ ¯˜ 20 4 1 2 2 10 log p p (1) where: 4 p is the amplitude of the fundamental component of a squarewave. 1 2 is the conversion loss. p 2 is the small signal dc gain of the AD831 when the LO input is driven fully positive or negative. �� � �� �������� ��������� �� �� �� ������� ������ �� ��� ��� ��� ��� ���� �������� ��� �� �� ��� �� � �������� ��� ��� �� �� �� �� �� �� ��� �� ��� �� ��� �� ��� �� ��� �� ���� ��� ��� ��� �� ��� ��� ��� �������� �������� �������� ��� ��� ��� ��� �� ���� �� ����� ���������� ����� �� ����� � �� �� � � ���� ������� Figure 1. Simplified Schematic Diagram REV. C REV. C |
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同様の説明 - AD831APZ |
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