Patent ID: 7366487
Filing Date: 2008-04-29
Classification: H03F,H03J

Abstract:
1. A receiving band switching circuit comprising: a first high frequency circuit through which a first frequency band signal passes; a second high frequency circuit through which a second frequency band signal passes; and a third high frequency circuit that is provided at the output of the first and second high frequency circuits, wherein the third high frequency circuit is constituted by a balanced circuit having balanced input terminals, the first high frequency circuit is coupled to one of the balanced input terminals, the second high frequency circuit is coupled to the other of the balanced input terminals, when the first frequency band signal outputted from the first high frequency circuit is inputted to the third high frequency circuit, the other of the balanced input terminals is grounded, and when the second frequency band signal outputted from the second high frequency circuit is inputted to the third high frequency circuit, one of the balanced input terminals is grounded.