Appeal No. 96-2224
Application No. 08/047,498
from the examiner’s rejection of claims 2-4, which constitute
all the claims remaining in the application. A first
amendment after final rejection was filed on June 6, 1995 but
was denied entry by the examiner [Paper No. 16]. A second
amendment after final rejection was filed on July 17, 1995 and
was entered by the examiner [Paper No. 19].
The disclosed invention pertains to a mixer input
circuit for converting an unbalanced RF signal into a balanced
signal to be mixed with an oscillation signal. The circuit is
made up of a distributed constant tuning circuit section, an
imbalance-balance conversion section and a mixer. The
invention uses a distributed constant line having first,
second and third central conductors which allows for
transformer coils to be eliminated.
Representative claim 3 is reproduced as follows:
3. A mixer input circuit for converting a signal from a
tuning section into a balanced signal and outputting the
balanced signal, said mixer input circuit comprising:
a distributed constant tuning circuit section having
a distributed constant line including a first central
conductor to which an imbalanced RF signal is connected and a
second central conductor coupled to said first central
conductor;
an imbalance-balance conversion section having a
2
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