| 摘要 |
<p>A mixer includes a doubly-balanced mixer core (24), an RF input section (26) coupled to the mixer core, and a biasing circuit (28) coupled to the RF input section. The RF input section includes a first transistor (Q11) coupled to a biasing circuit and to a first input of the mixer core for supplying a first current thereto. The base of the first transistor is driven by an RF input current, thus, the first current is responsive to the RF input current. The RF input section also includes a current mirror coupled to the first transistor, which mirrors the sum of the first current and the RF input current to produce a second current that is complementary to the first current for small variations of the RF input current. The current mirror is coupled to a second input of the mixer core to supply the second current.</p> |
