By Jess Jones Semiconductor company Alphawave Semi has reported a drop in revenue and profit for the six months to 30 June amid higher spending. The London-listed company said revenue plunged 51 per cent to $91m (£68.3m) in the first half of the year, which it blamed on a change in its business mix and a “significant reduction” of its legacy China business. Adjusted earnings before tax, interest, depreciation and amortisation (EBITDA) fell to a loss of $11.8 (£8.9m) from a profit of $32.4m (£24.3m) in the same period last year/ Alphawave also reported a higher operating loss, from $2.6m (£2m) …